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⎡

left square bracket upper corner

Left Square Bracket Upper Corner

Use an editor’s character map or Unicode entry feature to enter ⎡; the ordinary [ key gives a different character. In math typesetting, it starts a tall square bracket that can frame a multiline matrix or other structured text.

Text symbol
Search it as
tall bracket · matrix bracket · bracket piece · bracket corner · LaTeX bracket · U+23A1
Shows up in
Anything that takes text · its shape is whatever your font draws

What ⎡ means

⎡ starts the left side of a tall square bracket. To enter this exact bracket corner, use your editor’s character map or Unicode input method; the ordinary [ key inserts a different character. In typeset maths, it can frame a multiline matrix or other structured text when joined to a vertical extension and a lower corner.

On its own, ⎡ reads as an unfinished bracket or a stray character, not ordinary punctuation. Matching right-side corners and extensions make the other side of the tall bracket.

A technical typesetting character; by itself, it reads as a bracket fragment rather than ordinary punctuation.

Use [ for ordinary punctuation; ⎡ is only a tall bracket’s upper corner.

What it means when someone sends it to you

2 readings
⎡ appears alone in a message
An unfinished bracket fragment or an accidental character.
⎡⎢⎣ frames multiline content
The assembled left edge of one tall square bracket.

Don't confuse it with

2
[
Left Square Bracket
The ordinary left square bracket is a complete punctuation mark; ⎡ is a corner component for taller brackets.
⌈
Left Ceiling
⌈ begins ceiling notation, which rounds a value up to an integer; ⎡ starts a tall square bracket.

Combination ideas

2
Joined manually, these three pieces make the left edge of a tall square bracket.
A matching pair frames multiline content; both sides are assembled from pieces.

Questions people ask

1

Why does ⎡ show as a box?

The font in use may not include ⎡, so it can display as a missing-character box. A font with broader mathematical-symbol coverage may show it.

How to type ⎡

Windows (Word)
Alt+XType 23A1, 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 “left square bracket upper corner”.
Linux
Ctrl+Shift+UType 23a1, then Enter or Space.
HTML
⎡
CSS
\23A1
Ordinary left bracket
Type [ for the usual left square bracket; it is a separate character.
This Unicode corner
Use your editor’s character map or Unicode entry feature and search for U+23A1; exact steps depend on the app.
LaTeX
LaTeX is a math typesetting system. Its growable delimiter commands build a tall bracket; bare [ inserts ordinary punctuation, not this character.
Codes and encoding1 code points
HTML decimal
⎡
HTML hex
⎡
CSS content
content: "\23A1";
Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.
URL encoded
%E2%8E%A1
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.

Families this belongs to

2

Maths & numbers1,835 symbols

1️⃣📏📐✖️➕➖➗🟰♾️#️⃣*️⃣0️⃣

Shapes & colours597 symbols

🔴▶️🔵⭕⚫⚪▪️🔷🔹⏭️⏯️◀️