What ㏂ means
It lets a short Latin abbreviation fill a square text cell.
Older East Asian character sets arranged short abbreviations from the Latin alphabet in square forms so they could take up about the same footprint as a Chinese, Japanese, or Korean character. Unicode retains many such forms for compatibility with those sets.
Don't confuse it with
1a.m.
Plain Latin text with the same before-noon meaning; it uses four ordinary characters instead of one square character.
Questions people ask
1Does NFKC turn ㏂ into a.m.?
Yes. Unicode compatibility normalization maps ㏂ to plain “a.m.”; it keeps the time text but removes the square.
How to type ㏂
Windows (Word)
Alt+XType 33C2, then Alt+X to get ㏂.
Windows
Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).
macOS
Control+Command+SpaceOpen the character viewer and search “square am”.
Linux
Ctrl+Shift+UType 33c2, then Enter or Space.
HTML
㏂CSS
\33C2Codes and encoding1 code points
HTML decimal
㏂
HTML hex
㏂
CSS content
content: "\33C2";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E3%8F%82
1
On screen
1
Code points
1
JS .length
3
UTF-8 bytes
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.