The BLACK CIRCLE is displayed when typing in a password field, in order to hide characters from a screen recorder or shoulder surfing.
Font sets like Code2000 and the DejaVu family include coverage for each of the glyphs in the Geometric Shapes range.
[5] Among the fonts in widespread use,[6][7] full implementation is provided by Segoe UI Symbol and significant partial implementation of this range is provided by Arial Unicode MS and Lucida Sans Unicode, which include coverage for 83% (80 out of 96) and 82% (79 out of 96) of the symbols, respectively.
[8][9] The block has sixteen standardized variants defined to specify emoji-style (U+FE0F VS16) or text presentation (U+FE0E VS15) for the eight emoji.
[10] The following Unicode-related documents record the purpose and process of defining specific characters in the Geometric Shapes block: