Combining Enclosing Keycap is a Unicode combining mark used to turn certain characters into a keycap-style glyph. In emoji systems, it follows a base character—typically a digit 0–9, the number sign (#), or the asterisk (*)—to produce a single keycap unit that looks like a keyboard or telephone keypad button. It is not an emoji by itself; it functions only as part of a larger sequence and usually remains invisible when typed alone. If shown in isolation or without a valid base, many platforms display it as an enclosing outline on a dotted circle to indicate a combining mark.
The recommended emoji keycap sequence is base character + Variation Selector-16 (FE0F) + Combining Enclosing Keycap, which requests emoji-style presentation rather than plain text. Some older or lenient renderers may form a keycap without FE0F, but FE0F improves cross-platform consistency. On Apple/iOS and most modern platforms, typing a supported base followed by this character produces a rounded square keycap with the character inside; if the sequence is incomplete, iOS may show a fallback dotted-circle glyph or simply leave the mark visually inert. The result is a single grapheme cluster that users perceive as one emoji-like symbol.
This combining mark comes from Unicode’s set of diacritical marks for symbols and predates many modern emoji mechanisms, which is why keycaps are built with a combining strategy rather than a zero width joiner. Its practical use mirrors real-world keytops, so it’s common in UI, telephony, and keyboard contexts. Developers should treat it as an emoji component that affects presentation and shaping, dependent on font and platform support.
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Emoji History The emoji code/ image log of changes.
This emoji first appeared in OSX / iOS after the iOS 5 update.
