What ⎢ means
It fills the space between the top and bottom pieces. Place at the top, put ⎢ in the middle, and finish with . Repeat ⎢ for a taller stack. Math fonts that support these pieces design them to line up when stacked, so the bracket can span several lines of an expression.
Part of the collection
Don't confuse it with
4
Left Parenthesis Extension
The same stacking piece drawn round; in math fonts the two look nearly identical and get swapped in formulas.
Right Square Bracket Extension
The mirror half of the square pair; easy to swap when building matrices or tall brackets in plain text.
Integral Extension
The stacked piece used to build tall integral signs; it has a similar outline in math rendering.
CJK Unified Ideograph-4E28
CJK Vertical Stroke: a plain vertical line from Han characters that can pass for the bar in text without the math glyph.
Related characters
2
Combination ideas
1A three-piece tall left bracket, with one middle extension.
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
8
Collections with ⎢
1
How to type or find ⎢
- Search it as
- lbrackextender · bracket extender · tall left bracket · square bracket extender · math bracket
- Shows up in
- Anything that takes text · its shape is whatever your font draws
Windows (Word)
Windows
HTML
⎢CSS
\23A2unicode-math
As of 2026-10-08, the unicode-math symbol table maps this piece to
\lbrackextender.Codes and encoding1 code points
HTML decimal
⎢
HTML hex
⎢
CSS content
content: "\23A2";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%8E%A2
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.