Variation Selector-231

It requests a particular glyph for the ideograph before it. A glyph is a character's drawn form. VS231 has that job only in a registered ideographic variation sequence (IVS): a CJK ideograph (a character used in Chinese, Japanese, and Korean writing) followed by its selector. The pair narrows which accepted glyph a compatible font should show.

Different languages, regions, sources, and names can use different conventional drawings of what Unicode treats as the same character. IVSes preserve a particular distinction for names, records, publishing, or historical texts.

A Unicode working paper dated 2000-08-15 already described selectors as invisible marks that choose a glyph variant. That mechanism predates this selector's encoding, not the glyph traditions it records.

Why use a registered variation sequence?

They preserve a glyph distinction in plain text without encoding a new character. The IVD (Ideographic Variation Database) records which acceptable forms each registered pair requests, so software can interpret it consistently.

The IVD's first collection, Adobe-Japan1, was registered on 2007-12-14. Its collection history includes Hanyo-Denshi, KRName, Moji_Joho, MSARG, and CAAPH. Selectors choose one character's form; they do not make text italic or bold.

What does it mean when someone sends it alone?

Alone, it carries no conversational message. In a valid pair it can preserve a specific form in a name or source. Unsupported software may ignore the selector while showing the base ideograph.

Keep it attached to its base when the distinction matters. An unregistered pair has no defined request and should not be used in text interchange.