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Comma
The comma is a punctuation mark that appears in several variants in various 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, or with the appearance of a small, filled-in number 9.
The comma is used in many contexts and languages, mainly for separating parts of a sentence such as clauses, and items in lists, particularly when there are three or more items listed. The word ''comma'' comes from the Greek ''komma'' (κόμμα), which means a cut-off piece; specifically, in grammar, a short clause.〔''Oxford English Dictionary'', (''s.v.'' )〕
A comma-shaped mark is used as a diacritic in several writing systems: above the letter in Greek; below the letter in Latvian, Romanian, and Livonian, and is considered distinct from the cedilla.
==Comma variants==
The basic comma is defined in Unicode as but many variants by typography or language are also defined.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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