Jisho

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Wikipedia definition
1. Enclosed alphanumericsAn enclosed alphanumeric or circled alphanumeric (for example, Ⓣ) is a typographical symbol of an alphanumeric within a circle. The meaning of "enclosed" may also be extended to "bracketed", like in ⒣, and other not-closed enclosures. In Unicode there are two blocks for these characters: Enclosed Alphanumerics (U+2460—U+24FF), encoded in the Basic Multilingual Plane Enclosed Alphanumeric Supplement (U+1F100—U+1F1FF), encoded in the Supplementary Multilingual Plane.
Read “Enclosed alphanumerics” on English Wikipedia
Read “囲み文字” on Japanese Wikipedia
Read “Enclosed alphanumerics” on DBpedia

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