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Punctuation mark

Not to be confused with coma.

Comma

In Unicode U+002C , COMMA (HTML,· ,)

、	،	◌̦
Japanese comma	Arabic comma	combining comma below

The comma , is a punctuation mark that appears in several variants in different languages. It has the same shape as an apostrophe or single closing quotation mark (') in many typefaces, but it differs from them in being placed on the baseline of the text. Some typefaces render it as a small line, slightly curved or straight but inclined from the vertical. Other fonts give it the appearance of a miniature filled-in figure 9 on the baseline.

The comma is used in many contexts and languages, mainly to separate parts of a sentence such as clauses and items in lists mainly when there are three or more items listed. The word comma comes from the Greek κόμμα ( kómma ), which originally meant a cut-off piece, specifically in grammar, a short clause.^[1] ^[2]

A comma-shaped mark is used as a diacritic in several writing systems and is considered distinct from the cedilla. In Ancient Greek, the rough and smooth breathings (ἁ, ἀ) appear above the letter. In Latvian, Romanian, and Livonian, the comma diacritic appears below the letter, as in ș.

For the notation ⟨x⟩ and /x/ used in this article, see grapheme and phoneme respectively.

History [edit]

The development of punctuation is much more recent than the alphabet.

In the 3rd century BC, Aristophanes of Byzantium invented a system of single dots (théseis) at varying levels, which separated verses and indicated the amount of breath needed to complete each fragment of the text when reading aloud.^[3] The different lengths were signified by a dot at the bottom, middle, or top of the line. For a short passage, a komma in the form of a dot ⟨·⟩ was placed mid-level. This is the origin of the concept of a comma, although the name came to be used for the mark itself instead of the clause it separated.

The mark used today is descended from a /, a diagonal slash known as virgula suspensiva, used from the 13th to 17th centuries to represent a pause. The modern comma was first used by Aldus Manutius.^[4] ^[5]

Uses in English [edit]

Look up comma in Wiktionary, the free dictionary.

In general, the comma shows that the words immediately before the comma are less closely or exclusively linked grammatically to those immediately after the comma than they might be otherwise. The comma performs a number of functions in English writing. It is used in generally similar ways in other languages, particularly European ones, although the rules on comma usage – and their rigidity – vary from language to language.

The serial comma [edit]

Commas are placed between items in lists, as in They own a cat, a dog, two rabbits, and seven mice.

Whether the final conjunction, most frequently and, should be preceded by a comma, called the serial comma, is one of the most disputed linguistic or stylistic questions in English.

They served apples, peaches, and bananas. (serial comma used)
We cleaned up cores, pits and skins. (serial comma omitted)

The serial comma is used much more often, usually routinely, in the United States. A majority of American style guides mandate its use, including The Chicago Manual of Style, Strunk and White's classic The Elements of Style, and the U.S. Government Printing Office Style Manual.^{[ citation needed ]} Conversely, the AP Stylebook for journalistic writing advises against it.^{[ citation needed ]}

The serial comma is also known as the Oxford comma, Harvard comma, or series comma. Although less common in British English, its usage occurs within both American and British English. It is called the Oxford comma because of its long history of use by Oxford University Press.^[6]

According to New Hart's Rules, "house style will dictate" whether to use the serial comma. "The general rule is that one style or the other should be used consistently." No association with region or dialect is suggested, other than that its use has been strongly advocated by Oxford University Press.^[7] Its use is preferred by Fowler's Modern English Usage. It is recommended by the United States Government Printing Office, Harvard University Press, and the classic Elements of Style of Strunk and White.

Use of a comma may prevent ambiguity:

The sentence I spoke to the boys, Sam and Tom could mean either I spoke to the boys and Sam and Tom (I spoke to more than three people) or I spoke to the boys, who are Sam and Tom (I spoke to two people);
I spoke to the boys, Sam, and Tom – must be the boys and Sam and Tom (I spoke to more than three people).

The serial comma does not eliminate all confusion. Consider the following sentence:

I thank my mother, Anne Smith, and Thomas. This could mean either my mother and Anne Smith and Thomas (three people) or my mother, who is Anne Smith; and Thomas (two people). This sentence might be recast as "my mother (Anne Smith) and Thomas" for clarity.
I thank my mother, Anne Smith and Thomas. Because the comma after "mother" is conventionally used to prepare the reader for an apposite phrase – that is, a renaming of or further information about a noun – this construction suggests that my mother's name is "Anne Smith and Thomas". Compare "I thank my friend, Smith and Wesson", in which the ambiguity is obvious to those who recognise Smith and Wesson as a business name.

As a rule of thumb, The Guardian Style Guide ^[8] suggests that straightforward lists (he ate ham, eggs and chips) do not need a comma before the final "and", but sometimes it can help the reader (he ate cereal, kippers, bacon, eggs, toast and marmalade, and tea). The Chicago Manual of Style and other academic writing guides require the serial comma: all lists must have a comma before the "and" prefacing the last item in a series (see Differences between American and British usage below).

If the individual items of a list are long, complex, affixed with description, or themselves contain commas, semicolons may be preferred as separators, and the list may be introduced with a colon.

In news headlines, a comma might replace the word "and", even if there are only two items, in order to save space, as in this headline from Reuters:^[9]

Trump, Macron engage in a little handshake diplomacy.

Separation of clauses [edit]

Commas are often used to separate clauses. In English, a comma is used to separate a dependent clause from the independent clause if the dependent clause comes first: After I fed the cat, I brushed my clothes. (Compare this with I brushed my clothes after I fed the cat.) A relative clause takes commas if it is non-restrictive, as in I cut down all the trees, which were over six feet tall. (Without the comma, this would mean that only the trees more than six feet tall were cut down.) Some style guides prescribe that two independent clauses joined by a coordinating conjunction (for, and, nor, but, or, yet, so) must be separated by a comma placed before the conjunction.^[10] ^[11] In the following sentences, where the second clause is independent (because it can stand alone as a sentence), the comma is considered by those guides to be necessary:

Mary walked to the party, but she was unable to walk home.
Designer clothes are silly, and I can't afford them anyway.
Don't push that button, or twelve tons of high explosives will go off right under our feet!

In the following sentences, where the second half of the sentence is not an independent clause (because it does not contain an explicit subject), those guides prescribe that the comma be omitted:

Mary walked to the party but was unable to walk home.
I think designer clothes are silly and can't afford them anyway.

However, such guides permit the comma to be omitted if the second independent clause is very short, typically when the second independent clause is an imperative,^[10] ^[11] as in:

Sit down and shut up.

The above guidance is not universally accepted or applied. Long coordinate clauses are nonetheless usually separated by commas:^[12]

She had very little to live on, but she would never have dreamed of taking what was not hers.

A comma between clauses may change the connotation, reducing or eliminating ambiguity. In the following examples, the thing in the first sentence that is relaxing is the cool day, whereas in the second sentence it is the walk, since the introduction of commas makes "on a cool day" parenthetical:

They took a walk on a cool day that was relaxing.

They took a walk, on a cool day, that was relaxing.

As more clauses are introduced, ambiguity accumulates, but when commas separate each clause, the clauses clearly become modifiers of just one thing. In the second sentence below, that thing is the walk:

They took a walk in the park on a cool day that was relaxing.

They took a walk, in the park, on a cool day, that was relaxing.

In some languages, such as German and Polish, stricter rules apply on comma usage between clauses, with dependent clauses always being set off with commas, and commas being generally proscribed before certain coordinating conjunctions.

The joining of two independent sentences with a comma and no conjunction (as in "It is nearly half past five, we cannot reach town before dark.") is known as a comma splice and is sometimes considered an error in English;^[13] in most cases a semicolon should be used instead. A comma splice should not be confused, though, with asyndeton, a literary device used for a specific effect in which coordinating conjunctions are purposely omitted.

Certain adverbs [edit]

Commas are always used to set off certain adverbs at the beginning of a sentence, including however, in fact, therefore, nevertheless, moreover, furthermore, and still.

Therefore, a comma would be appropriate in this sentence.
Nevertheless, I will not use one.

If these adverbs appear in the middle of a sentence, they are followed and preceded by a comma. As in the second of the two examples below, if a semicolon separates the two sentences and the second sentence starts with an adverb, this adverb is preceded by a semicolon and followed by a comma.

In this sentence, furthermore, commas would also be called for.
This sentence is similar; however, a semicolon is necessary as well.

Using commas to offset certain adverbs is optional, including then, so, yet, instead, and too (meaning also).

So, that's it for this rule. or
So that's it for this rule.
A comma would be appropriate in this sentence, too. or
A comma would be appropriate in this sentence too.

Parenthetical phrases [edit]

Commas are often used to enclose parenthetical words and phrases within a sentence (i.e., information that is not essential to the meaning of the sentence). Such phrases are both preceded and followed by a comma, unless that would result in a doubling of punctuation marks or the parenthetical is at the start or end of the sentence. The following are examples of types of parenthetical phrases:

Introductory phrase: Once upon a time, my father ate a muffin. ^[14]
Interjection: My father ate the muffin, gosh darn it!
Aside: My father, if you don't mind me telling you this, ate the muffin.
Appositive: My father, a jaded and bitter man, ate the muffin.
Absolute phrase: My father, his eyes flashing with rage, ate the muffin.
Free modifier: My father, chewing with unbridled fury, ate the muffin.
Resumptive modifier: My father ate the muffin, a muffin which no man had yet chewed.
Summative modifier: My father ate the muffin, a feat which no man had attempted.

Between adjectives [edit]

A comma is used to separate coordinate adjectives (i.e., adjectives that directly and equally modify the following noun). Adjectives are considered coordinate if the meaning would be the same if their order were reversed or if and were placed between them. For example:

The dull, incessant droning but the cute little cottage.
The devious lazy red frog suggests there are lazy red frogs (one of which is devious), while the devious, lazy red frog does not carry this connotation.

Before quotations [edit]

Some writers precede quoted material that is the grammatical object of an active verb of speaking or writing with a comma, as in Mr. Kershner says, "You should know how to use a comma." Quotations that follow and support an assertion are often preceded by a colon rather than a comma.

Other writers do not put a comma before quotations unless one would occur anyway. Thus they would write Mr. Kershner says "You should know how to use a comma."

In dates [edit]

Month day, year [edit]

When a date is written as a month followed by a day followed by a year, a comma separates the day from the year: December 19, 1941. This style is common in American English. The comma is used to avoid confusing consecutive numbers: December 19 1941. Most style manuals, including The Chicago Manual of Style ^[15] and the AP Stylebook,^[16] also recommend that the year be treated as a parenthetical, requiring a second comma after it: "Feb. 14, 1987, was the target date."

If just month and year are given, no commas are used:^[17] "Her daughter April may return in June 2009 for the reunion."

Day month year [edit]

When the day precedes the month, the month name separates the numeric day and year, so commas are not necessary to separate them: "The Raid on Alexandria was carried out on 19 December 1941."

In geographical names [edit]

Commas are used to separate parts of geographical references, such as city and state (Dallas, Texas) or city and country (Kampala, Uganda). Additionally, most style manuals, including The Chicago Manual of Style ^[18] and the AP Stylebook,^[19] recommend that the second element be treated as a parenthetical, requiring a second comma after: "The plane landed in Kampala, Uganda, that evening." ^[20]

The United States Postal Service^[21] and Royal Mail^[22] recommend leaving out punctuation when writing addresses on actual letters and packages, as the marks hinder optical character recognition.

In mathematics [edit]

Similar to the case in natural languages, commas are often used to delineate the boundary between multiple mathematical objects in a list (e.g., $(3,5,12)$ ). Commas are also used to indicate the comma derivative of a tensor.^[23]

In numbers [edit]

In representing large numbers, from the right side to the left, English texts usually use commas to separate each group of three digits in front of the decimal.^[24] This is almost always done for numbers of six or more digits, and often for four or five digits but not in front of the number itself. However, in much of Europe, Southern Africa and Latin America, periods or spaces are used instead; the comma is used as a decimal separator, equivalent to the use in English of the decimal point.^[25] In India, the groups are two digits, except for the rightmost group. In some styles, the comma may not be used for this purpose at all (e.g. in the SI writing style^[26]); a space may be used to separate groups of three digits instead.

In names [edit]

Commas are used when rewriting names to present the surname first, generally in instances of alphabetization by surname: Smith, John. They are also used before many titles that follow a name: John Smith, Ph.D.

Similarly in lists that are presented with an inversion: ...; socks, green: 3 pairs; socks, red: 2 pairs; tie, regimental: 1.

Ellipsis [edit]

Commas may be used to indicate that a word, or a group of words, has been omitted,^[27] as in The cat was white; the dog, brown. (Here the comma replaces was.)

Vocative [edit]

Commas are placed before, after, or around a noun or pronoun used independently in speaking to some person, place, or thing:

I hope, John, that you will read this.

Between the subject and predicate [edit]

In his 1785 essay An Essay on Punctuation, Joseph Robertson advocated a comma between the subject and predicate of long sentences for clarity; however, this usage is regarded as an error in modern times.

The good taste of the present age, has not allowed us to neglect the cultivation of the English language.
Whoever is capable of forgetting a benefit, is an enemy to society.

Differences between American and British usage in placement of commas and quotation marks [edit]

The comma and the quotation mark can be paired in several ways.

In Great Britain and many other parts of the world, punctuation is usually placed within quotation marks only if it is part of what is being quoted or referred to:^[28] ^[29] ^[30]

My mother gave me the nickname "Bobby Bobby Bob Bob Boy", which really made me angry.

In American English, the comma is commonly included inside a quotation mark:^[28] ^[29]

My mother gave me the nickname "Bobby Bobby Bob Bob Boy," which really made me angry.

During the Second World War, the British carried the comma over into abbreviations. Specifically, "Special Operations, Executive" was written "S.O.,E.". Nowadays, even the full stops are frequently discarded.^[31]

Languages other than English [edit]

Western European languages [edit]

Western European languages like German, French, Italian, Spanish, and Portuguese use the same comma as English with similar spacing, though usage may be somewhat different. For instance, in Standard German, subordinate clauses are always preceded by commas.

Comma variants [edit]

The basic comma is defined in Unicode as U+002C , COMMA (HTML,· ,), and many variants by typography or language are also defined.


Character	Unicode point	Unicode name	Notes
,	U+002C	COMMA	Prose in European languages Decimal separator in Continental Europe, Brazil, and most other Latin American countries
ʻ	U+02BB	MODIFIER LETTER TURNED COMMA	Used as ʻokina in Hawaiian
،	U+060C	ARABIC COMMA	Used in all languages using Arabic alphabet Also used in other languages, including Syriac and Thaana
⸲	U+2E32	TURNED COMMA	Palaeotype transliteration symbol; indicates nasalization
⸴	U+2E34	RAISED COMMA
⹁	U+2E41	REVERSED COMMA	Used in Sindhi, among others
⹉	U+2E49	DOUBLE STACKED COMMA	Used in the Eastern Orthodox liturgical book Typikon
、	U+3001	IDEOGRAPHIC COMMA	Used in Chinese and Japanese writing systems (see § Languages other than Western European, below)
︐	U+FE10	PRESENTATION FORM FOR VERTICAL COMMA	Used in vertical writing
︑	U+FE11	PRESENTATION FORM FOR VERTICAL IDEOGRAPHIC COMMA	Used in vertical writing
﹐	U+FE50	SMALL COMMA
﹑	U+FE51	SMALL IDEOGRAPHIC COMMA
，	U+FF0C	FULLWIDTH COMMA
､	U+FF64	HALFWIDTH IDEOGRAPHIC COMMA

Some languages use a completely different sort of character for the purpose of the comma.

Character	Unicode point	Unicode name	Notes
·	U+00B7	MIDDLE DOT	Used as a comma in Georgian
∘	U+2218	RING OPERATOR	Used as a comma in Malayalam
՝	U+055D	ARMENIAN COMMA
߸	U+07F8	NKO COMMA
፣	U+1363	ETHIOPIC COMMA
᠂	U+1802	MONGOLIAN COMMA
᠈	U+1808	MONGOLIAN MANCHU COMMA
⹌	U+2E4C	MEDIEVAL COMMA
꓾	U+A4FE	LISU PUNCTUATION COMMA
꘍	U+A60D	VAI COMMA
꛵	U+A6F5	BAMUM COMMA
𑑍	U+1144D	NEWA COMMA
𑑚	U+1145A	NEWA DOUBLE COMMA
𖺗	U+16E97	MEDEFAIDRIN COMMA
𝪇	U+1DA87	SIGNWRITING COMMA

There are also a number of comma-like diacritics with "COMMA" in their Unicode names. These do not serve a punctuation function. A comma-like low quotation mark is also available (shown below; raised single quotation marks are not shown).

Character	Unicode point	Unicode name	Notes
ʽ	U+02BD	MODIFIER LETTER REVERSED COMMA	Indicates weak aspiration
‍̒	U+0312	COMBINING TURNED COMMA ABOVE	Latvian diacritic cedilla above
‍̓	U+0313	COMBINING COMMA ABOVE	Greek psili , smooth breathing mark
‍̔	U+0314	COMBINING REVERSED COMMA ABOVE	Greek dasia , rough breathing mark
‍̕	U+0315	COMBINING COMMA ABOVE RIGHT
‍̦	U+0326	COMBINING COMMA BELOW	Diacritical mark in Romanian, Latvian, Livonian
‚	U+201A	SINGLE LOW-9 QUOTATION MARK	Opening single quotation mark in some languages

Various other Unicode characters combine commas or comma-like figures with other characters, and are not shown here..

Languages other than Western European [edit]

Modern Greek uses the same Unicode comma for its kómma (κόμμα)^[32] and it is officially romanized as a Latin comma,^[33] but it has additional roles owing to its conflation with the former hypodiastole, a curved interpunct used to disambiguate certain homonyms. The comma therefore functions as a silent letter in a handful of Greek words, principally distinguishing ό,τι (ó,ti, "whatever") from ότι (óti, "that").^[32]

The enumeration or ideographic comma — U+3001 、 IDEOGRAPHIC COMMA — is used in Chinese, Japanese punctuation, and somewhat in Korean punctuation. In the People's Republic of China and in North/South Korea, this comma (t頓號, s顿号, pdùnhào) is usually used only to separate items in lists, while in Japan it is the more common form of comma (読点, rtōten, lit. "clause mark"). In documents that mix Japanese and Latin scripts, the full-width comma ( U+FF0C ， FULLWIDTH COMMA) is used; this is the standard form of comma (t逗號, s逗号, pdòuhào) in China. Since East Asian typography permits commas to join clauses dealing with certain topics or lines of thought, commas may separate subjects and predicates and constructions that would be considered a "comma splice" in English are acceptable and commonly encountered.

Korean punctuation uses both commas and interpuncts for lists.

In Unicode 5.2.0 "numbers with commas" ( U+1F101 🄁 through U+1F10A 🄊 ) were added to the Enclosed Alphanumeric Supplement block for compatibility with the ARIB STD B24 character set.^[34] ^[35]

The comma in the Arabic script (used by Arabic, Urdu, and Persian, etc.) is inverted, upside-down: ⟨،⟩ ( U+060C ، ARABIC COMMA), in order to distinguish it from the Arabic diacritic ḍammah ⟨ُ⟩, representing the vowel /u/, which is similarly comma-shaped.^[36] In Arabic texts, Western-styled comma (٫) is used as a decimal point.

Reversed comma ( U+2E41 ⹁ REVERSED COMMA) is used in Sindhi when written in Arabic script. It is different from the standard Arabic comma.

Hebrew script is also written from right to left. However, Hebrew punctuation includes only a regular comma (,).

Dravidian languages such as Tamil, Telugu, Kannada, and Malayalam also use the punctuation mark in similar usage to that of European languages with similar spacing.^[37]

Computing [edit]

In the common character encoding systems Unicode and ASCII, character 44 (0x2C) corresponds to the comma symbol. The HTML numeric character reference is ,.

In many computer languages commas are used as a field delimiter to separate arguments to a function,^[38] to separate elements in a list, and to perform data designation on multiple variables at once.

In the C programming language the comma symbol is an operator which evaluates its first argument (which may have side-effects) and then returns the value of its evaluated second argument. This is useful in for statements and macros.

In Smalltalk and APL, the comma operator is used to concatenate collections, including strings. In APL, it is also used monadically to rearrange the items of an array into a list.

In Prolog, the comma is used to denote Logical Conjunction ("and").

The comma-separated values (CSV) format is very commonly used in exchanging text data between database and spreadsheet formats.

Diacritical usage [edit]

◌̦

Combining comma below

Diacritics in Latin & Greek
accent
acute ´
double acute ˝
grave `
double grave ̏
circumflex ˆ
caron, háček ˇ
breve ˘
inverted breve ̑
cedilla ¸
diaeresis, umlaut ¨
dot ·
palatal hook ̡
retroflex hook ̢
hook above ̉
horn ̛
iota subscript ͅ
macron ˉ
ogonek, nosinė ˛
perispomene ͂
overring ˚
underring ˳
rough breathing ῾
smooth breathing ᾿
Marks sometimes used as diacritics
apostrophe '
bar ◌̸
colon :
comma ,
full stop/period .
hyphen ˗
prime ′
tilde ~
Diacritical marks in other scripts
Arabic diacritics
Early Cyrillic diacritics
kamora ҄
pokrytie ҇
titlo ҃
Hebrew diacritics
Indic diacritics
anusvara ंং ଂ ം
avagraha ऽ ঽ ଽ ఽ ഽ ྅
chandrabindu ँఁ ྃ
nuqta ़
virama ्്్್ ් ်
visarga ः ঃ ଃ ஃ
Gurmukhī diacritics
Khmer diacritics
Thai diacritics
IPA diacritics
Japanese kana diacritics
dakuten ﾞ
handakuten ﾟ
Syriac diacritics
Related
Dotted circle ◌
Punctuation marks
Logic symbols

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The comma is used as a diacritic mark in Romanian under ⟨s⟩ (⟨Ș⟩, ⟨ș⟩), and under ⟨t⟩ (⟨Ț⟩, ⟨ț⟩). A cedilla is occasionally used instead of it, but this is technically incorrect. The symbol ⟨d̦⟩ ('d with comma below') was used as part of the Romanian transitional alphabet (19th century) to indicate the sounds denoted by the Latin letter ⟨z⟩ or letters ⟨dz⟩, where derived from a Cyrillic ѕ (⟨ѕ⟩, /dz/). The comma and the cedilla are both derivative of ⟨ʒ⟩ (a small cursive ⟨z⟩) placed below the letter. From this standpoint alone, ⟨ș⟩, ⟨ț⟩, and ⟨d̦⟩ could potentially be regarded as stand-ins for /sz/, /tz/, and /dz/ respectively.

In Latvian, the comma is used on the letters ⟨ģ⟩, ⟨ķ⟩, ⟨ļ⟩, ⟨ņ⟩, and historically also ⟨ŗ⟩, to indicate palatalization. Because the lowercase letter ⟨g⟩ has a descender, the comma is rotated 180° and placed over the letter. Although their Adobe glyph names are 'letter with comma', their names in the Unicode Standard are 'letter with a cedilla'. They were introduced to the Unicode standard before 1992 and, per Unicode Consortium policy, their names cannot be altered.

In Livonian, whose alphabet is based on a mixture of Latvian and Estonian alphabets, the comma is used on the letters ⟨ḑ⟩, ⟨ļ⟩, ⟨ņ⟩, ⟨ŗ⟩, ⟨ț⟩ to indicate palatalization in the same fashion as Latvian, except that Livonian uses ⟨ḑ⟩ and ⟨ț⟩ to represent the same palatal plosive phonemes which Latvian writes as ⟨ģ⟩ and ⟨ķ⟩ respectively.

In Czech and Slovak, the diacritic in the characters ⟨ď⟩, ⟨ť⟩, and ⟨ľ⟩ resembles a superscript comma, but it is used instead of a caron because the letter has an ascender. Other ascender letters with carons, such as letters ⟨ȟ⟩ (used in Finnish Romani and Lakota) and ⟨ǩ⟩ (used in Skolt Sami), did not modify their carons to superscript commas.

In 16th-century Guatemala, the archaic letter cuatrillo with a comma (⟨Ꜯ⟩ and ⟨ꜯ⟩) was used to write Mayan languages.^[39]

References [edit]

^ "comma". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ Chisholm, Hugh, ed. (1911). "Comma". Encyclopædia Britannica. 6 (11th ed.). Cambridge University Press. p. 765.
^ Truss, Lynn (2004). Eats, Shoot & Leaves: The Zero Tolerance Approach to Punctuation. New York: Gotham Books. p. 72. ISBN1-59240-087-6.
^ "Reading Before Punctuation – Introduction to Latin Literature pamphlet" (PDF). Archived from the original (PDF) on September 2, 2006. , Haverford College
^ Manuscript Studies, Medieval and Early Modern – Palaeography: Punctuation glossary
^ "What is the 'Oxford comma'?". Oxford Dictionaries. Oxford University Press. Retrieved 2015-09-15 .
^ Ritter, R. M. (2005). New Hart's Rules (Second ed.). Oxford, UK: Oxford University Press. pp. 77, 300. ISBN978-0-19-861041-0.
^ "Guardian and Observer style guide: O". The Guardian. London. 2008-12-19. Retrieved April 1, 2010.
^ "Trump, Macron engage in a little handshake diplomacy". Reuters. 2017-05-25. Retrieved 2017-07-10 .
^ ^a ^b Fowler, H. W.; Burchfield, R. W. (2000). The New Fowler's Modern English Usage (Third, revised ed.). Oxford: Oxford University Press. p. 162. ISBN0-19-860263-4.
^ ^a ^b Nancy Tuten. "When to Use a Comma before "And"". Getitwriteonline.com . Retrieved 2012-03-25 .
^ Swan, Michael (2006). Practical English Usage. Oxford University Press.
^ Strunk, William (May 2007). The Elements of Style. Filiquarian Publishing, LLC. p. 12. ISBN978-1-59986-933-9. Do not join independent clauses by a comma.
^ Garner's Modern American Usage, (Oxford: 2003, p. 655)
^ Chicago Manual of Style: "It's conventional to put a comma after the year. The commas are like parentheses here, so it doesn't make sense to have only one."
^ "Ask the Editor". AP Stylebook. 3 December 2008. Archived from the original on 4 December 2008. Retrieved 2019-06-07 . When a phrase refers to a month, day and year, set off the year with commas... Feb. 14, 1987, was the target date.
^ "Top 5 Comma Errors". 30 June 2008.
^ "Mary traveled to Seattle, Washington, before going on to California." "FAQ item: Commas". The Chicago Manual of Style Online . Retrieved 2021-05-20 .
^ "Acme Pens was founded in Padua, Italy, in 2004." "Ask the Editor". AP Stylebook. Archived from the original on 2008-12-04. Retrieved 2008-10-29 .
^ Chicago Manual of Style, 14th ed., §5.67.
^ "Preparing Shipments". The United States Postal Service.
^ "How to address your mail". Royal Mail (UK).
^ Weisstein, Eric W. "Comma". mathworld.wolfram.com . Retrieved 2020-08-22 .
^ "Common Symbols in Mathematics | SkillsYouNeed". www.skillsyouneed.com . Retrieved 2020-08-22 .
^ Weisstein, Eric W. "Decimal Point". mathworld.wolfram.com . Retrieved 2020-08-22 .
^ Institute of Electrical and Electronics Engineers, Inc.
^ "Writing Tips: Comma Use". Center for Writing Studies. University of Illinois at Urbana–Champaign. Retrieved 12 March 2017. A comma is sometimes used to indicate the omission of one or more words.
^ ^a ^b "Punctuating Around Quotation Marks" (blog). Style Guide of the American Psychological Association. 2011. Retrieved 2015-09-12 .
^ ^a ^b Stephen Wilbers. "Frequently Asked Questions Concerning Punctuation" (web site) . Retrieved 2015-09-10 .
^ Scientific Style and Format: The CBE Manual for Authors, Editors and Publishers (PDF). Cambridge, U.K.: Cambridge University Press. 2002. ISBN9780521471541 . Retrieved 2015-09-04 . In the British style (OUP 1983), all signs of punctuation used with words and quotation marks must be placed according to the sense.
^ Lovell, Stanley P. (1963). Of Spies and Stratagems. Englewood Cliffs, New Jersey: Prentice Hall. ASIN B000LBAQYS.
^ ^a ^b Nicolas, Nick. "Greek Unicode Issues: Punctuation Archived 2012-08-06 at archive.today". 2005. Accessed 7 October 2014.
^ Ελληνικός Οργανισμός Τυποποίησης [Ellīnikós Organismós Typopoíīsīs, "Hellenic Organization for Standardization"]. ΕΛΟΤ 743, 2η Έκδοση [ELOT 743, 2ī Ekdosī, "ELOT 743, 2nd ed."]. ELOT (Athens), 2001. (in Greek).
^ Suignard, Michel (11 March 2008). "Japanese TV Symbols – ISO/IEC JTC1/SC2/WG2 N 33 97 – UTC L2/08 - 077 R 2" (PDF). The Unicode Consortium. p. 6. Retrieved 2018-11-20 .
^ The Unicode Standard, Version 5.2: Chapter 15.9 – Symbols – Enclosed and Square (PDF). The Unicode Consortium. December 2009. p. 490 (PDF: 33). ISBN9781936213009 . Retrieved 2018-11-20 .
^ Huda Smitshuijzen AbiFarès (2001). Arabic Typography: A Comprehensive Sourcebook. London: Saqi Books. p. 106. ISBN978-0-86356-347-8. The comma used in Arabic script is not only a mirror image of its Latin counterpart, but its tail is also turned upwards in order to avoid any possibility of confusing it with the Dammah, the u short vowel mark.
^ ta:கால்புள்ளி (தமிழ் நடை)
^ Kling, Felix; Scholz, Florian; Shepherd, Eric (23 March 2019). "Trailing commas". Mozilla Blog. Archived from the original on 5 April 2019. Retrieved 31 May 2019.
^ Everson, Michael (2006-01-30). "N3028: Proposal to add Mayanist Latin letters to the UCS" (PDF) . Retrieved 2017-02-04 .

External links [edit]

Wikimedia Commons has media related to commas.

English comma rules and exercises
Major Comma Uses
Notes on Commas
Comma guidelines – also helpful for non-native speakers
Grammar, Punctuation, and Capitalization – a comprehensive online guide by NASA
The Oxford Comma: A Solution – a satirical suggestion to settle the problem of the Oxford Comma once and for all
The Quotta and the Quottiod – another satirical compromise between the American and British traditions relating to quotes and commas.
Top 6 Common Comma Problems Infographic by Jennifer Frost