What ⒇ means
It marks the twentieth item in a sequence. Read it as “number twenty,” usually at the start of a list, index, or enumeration.
Enclosed-number characters were designed as numbered bullets. Parenthesized forms offered a typewriter-style alternative to circled numbers; rich-text list formatting later took over much of that job. Japanese legal writing also uses a related convention for numbering items in parentheses, but that does not mean every document uses this exact character.
Formal and compact; it reads like a document marker.
Don't confuse it with
1Questions people ask
1Why does ⒇ look different in different fonts?
It can. Its shape follows the font; if the font lacks the character, the app or system may show a fallback instead.
How to type ⒇
Windows (Word)
Alt+XType 2487, then Alt+X to get ⒇.
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 “parenthesized number twenty”.
Linux
Ctrl+Shift+UType 2487, then Enter or Space.
HTML
⒇CSS
\2487Codes and encoding1 code points
HTML decimal
⒇
HTML hex
⒇
CSS content
content: "\2487";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%92%87
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.