What ㌃ means
It represents an are: 100 square metres of land. The are is French in origin. A Japanese account of travel in Europe and America from 1877 records it as 100 square metres. In Japan it is close in area to the older land measure 畝. Ares have also served to measure farmland in continental Europe.
㌃ is the squared Japanese form of アール, written in katakana (a Japanese syllabary). The unit symbol is lowercase Latin a: use a for plain measurement notation and ㌃ when its boxed Japanese style matters. One hectare equals 100 ares; its boxed Japanese form is ㌶.
Don't confuse it with
4Questions people ask
1Will NFKC keep the box?
No. NFKC and NFKD turn ㌃ into アール; NFC and NFD preserve the boxed character.
How to type ㌃
Windows (Word)
Alt+XType 3303, then Alt+X to get ㌃.
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 aaru”.
Linux
Ctrl+Shift+UType 3303, then Enter or Space.
HTML
㌃CSS
\3303Codes and encoding1 code points
HTML decimal
㌃
HTML hex
㌃
CSS content
content: "\3303";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E3%8C%83
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.