What ⦒ means
It is a postfix stretchy fence.
In MathML Core, postfix means ⦒ follows the expression, while stretchy means layout can enlarge it to fit a tall group.
What is the matching left bracket for ⦒?
⦑ is its matching left-angle bracket.
ISO/IEC DTR 9573-13, second edition, lists ⦑ as langd (“left angle, dot”) and ⦒ as rangd (“right angle, dot”).
Don't confuse it with
4Questions people ask
1Why does ⦒ show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type ⦒
Windows (Word)
Alt+XType 2992, 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 “right angle bracket with dot”.
Linux
Ctrl+Shift+UType 2992, then Enter or Space.
HTML
⦒CSS
\2992Codes and encoding1 code points
HTML decimal
⦒
HTML hex
⦒
CSS content
content: "\2992";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A6%92
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.