What ⟄ means
A superset contains another set.
Unicode's name gives no formula, so follow the paper, textbook, or formal system using it.
When did ⟄ enter Unicode?
In 2003, a mathematical-publishing request led to paired “bounded subset” and “bounded superset” marks. The cited example used the subset; regular notation called for its matching superset.
In 2004, Unicode accepted the pair as open subset ⟃ and open superset ⟄.
Don't confuse it with
1Questions people ask
1Why does ⟄ look different?
Font-dependent. An unsupported font may show a box or fallback glyph.
How to type ⟄
Windows (Word)
Alt+XType 27C4, 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 “open superset”.
Linux
Ctrl+Shift+UType 27c4, then Enter or Space.
HTML
⟄CSS
\27C4How to type ⟄
Linux: press Ctrl+Shift+U, type 27C4, then press Enter.
LaTeX
With unicode-math, enter ⟄ or use \supersetcirc.
Microsoft Word
As of 2026, type 27C4, then press Alt+X.
Codes and encoding1 code points
HTML decimal
⟄
HTML hex
⟄
CSS content
content: "\27C4";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%9F%84
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.