U+3001 IDEOGRAPHIC COMMA

U+3001 was added to Unicode in version 1.1 (1993). It belongs to the block CJK Symbols and Punctuation in the Basic Multilingual Plane.

This character is a Other Punctuation and is commonly used, that is, in no specific script. It is also used in the scripts Bopomofo, Hangul, Han, Hiragana, Katakana, Yi.

The glyph is not a composition. It has a Wide East Asian Width. In bidirectional context it acts as Other Neutral and is not mirrored. In text U+3001 behaves as Close Punctuation regarding line breaks. It has type SContinue for sentence and Other for word breaks. The Grapheme Cluster Break is Any.

The Wikipedia has the following information about this codepoint:

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. According to the Oxford English Dictionary, the word comma comes directly from the Greek komma (κόμμα), which means something cut off or a short clause. A comma can also be used as a diacritic when combined with other characters.