Variation Selector-23

A preceding base character gives this selector its job.

Variation Selector-23 works only after a base character, where it can request a specific written form without turning that form into a separate character. The complete pair is a variation sequence; for ideographs, a registered Ideographic Variation Sequence (IVS) ties the pair to a defined set of allowed glyph shapes.

The mechanism was already being designed by August 8, 2001: a Unicode proposal put the selectors in Plane 14, a supplementary area, to preserve exact forms in personal names, East Asian glyph collections, plain-text databases, and Buddhist texts. The aim was to preserve a chosen glyph without encoding every visual form as a new character.

Why doesn't VS23 mean the same thing everywhere?

The base character and registered collection decide the requested glyph.

VS23 is not a universal command such as “use the Japanese shape.” Its effect is defined by the whole sequence and, for an IVS, by the collection that registered it. Separate collections exist because scholars, governments, publishers, and records from different regions or eras can need different glyph distinctions.

That design keeps the selector number from becoming a hidden alphabet of meanings: VS23 after one ideograph can identify a different set of allowed shapes than VS23 after another. The sequence carries the distinction; the selector alone does not.

Why is VS23 invisible?

It has no visible glyph of its own.

On a supported registered sequence, text software may choose the specified glyph. On an unsupported or unregistered sequence, Unicode’s fallback is the base character’s normal glyph while VS23 remains invisible, so the text can look unchanged.

Use it only after the intended base character in a documented sequence. It is not a bold, italic, or emoji switch: variation selectors have defined effects only in sanctioned combinations, and span-wide text styling is outside their job.