Block: Enclosed Alphanumerics

Range U+2460 - U+24FF
Official Chart http://www.unicode.org/charts/PDF/U2460.pdf
Wikipedia Enclosed Alphanumerics is a Unicode block of typographical symbols of an alphanumeric within a circle, a bracket or other not-closed enclosure, or ending in a full stop. There is another block for these characters (U+1F100U+1F1FF), encoded in the Supplementary Multilingual Plane, which contains the set of Regional Indicator Symbols as of Unicode 6.0.

Purpose
Many of these characters were originally intended for use as bullets for lists.
https://en.wikipedia.org/wiki/Enclosed_Alphanumerics
Characters