What ⦐ means
It closes a grouped mathematical expression. MathML, a markup language for formulas, classifies ⦐ as a postfix fence: it comes after the expression it closes.
MathML's operator dictionary—its list of display rules—marks it stretchable and symmetric, so a renderer can lengthen it to fit a tall expression and center it on the formula's middle line. These are layout instructions; the surrounding notation determines the expression's mathematical meaning.
Related characters
3
Left Square Bracket With Tick In Top Corner
Unicode pairs ⦍ and ⦐ as left/right mirror forms; MathML treats ⦍ as the opening fence and ⦐ as the closing one.
Right Square Bracket With Tick In Bottom Corner
This is the same right square bracket with its tick in the bottom corner; MathML gives it the same closing, stretchable-fence role.
Left Square Bracket With Tick In Bottom Corner
This left bracket has a bottom-corner tick and is the mirror form of ⦎.
Questions 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.
More like this
9
How to type or find ⦐
- Search it as
- ⦐ · U+2990 · ⦐ MathML · rbrkslu
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
macOS
HTML
⦐CSS
\2990XML entity reference
In XML documents that declare W3C's ISOAMSC entities, write
⦐ for ⦐.Codes and encoding1 code points
HTML decimal
⦐
HTML hex
⦐
CSS content
content: "\2990";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%A6%90
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.