What 🅏 means
“Water closet” is recorded by 1755 for a small private room with a toilet flushed by water; W.C. is recorded by 1815 as a toilet abbreviation. The square turns those initials into a single, sign-like text character.
English dictionaries label spoken WC old-fashioned; French uses W.-C. as a familiar spoken abbreviation.
Don't confuse it with
1Questions people ask
1Why did this turn into plain WC?
NFKC, a Unicode text-cleanup form, unfolds 🅏 to plain `WC` when software applies it. The restroom meaning stays, but the square styling does not.
How to type 🅏
🅏\1F14FCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.
