enclosed character; circled alphanumeric
A typographic term for a character or symbol placed inside a circle, square, or other enclosure. Common in Japanese text for emphasis, numbering, or special notation.
Enclosed characters are often used in maps and guide signs.
This font includes circled numeric characters.
Compound of 囲み (kakomi, 'enclosure') + 文字 (moji, 'character'). The term is straightforward and modern, with no obscure historical derivation.