Left Square Bracket Upper Corner Symbol
⎡ is the left square bracket with an upper-corner style used in technical and computer text.
U+23A1
⎡ is a Unicode technical symbol often used as a visual bracket-like marker. It appears in system fonts and programming-related text where a specific bracket shape is needed. You can copy it directly or use its Unicode code point in code.
Left Square Bracket Upper Corner Symbol Meaning
⎡ is the Unicode character named “LEFT SQUARE BRACKET UPPER CORNER” (U+23A1). It represents a left bracket form with an upper-corner style, distinct from a standard ASCII “[”. Because it has a specialized shape, it’s commonly used in technical writing, legacy documents, and text that mirrors mathematical or diagram-like notation. In practice, it helps convey grouping, framing, or alignment in contexts where typographic consistency matters. Developers may also use it when they need a particular bracket glyph available in Unicode rather than relying on plain ASCII characters.
Common uses
- •Formatting structured text with a bracket-like visual cue in technical documents
- •Using in math/notation mockups where a specific “upper corner” bracket glyph is desired
- •Designing UI labels or diagram callouts that require a non-standard bracket shape
- •Creating templates or code comments that visually distinguish grouped sections
- •Copy/pasting into reports, forms, or spreadsheets to match a legacy typography style
Examples
⎡ Left Square Bracket Upper Corner
- ⎡Result: ⎡value⎤
- ⎡Group A ⎡item1, item2, item3⎤
- ⎡Index range ⎡0..n⎤
- ⎡Options block: ⎡fast⎤ / ⎡safe⎤
- ⎡Step ⎡1⎤: initialize variables
Variations
Ready to copy
Technical codes
| Unicode | U+23A1 | |
| HTML Entity | ⎡ | |
| HTML Code | ⎡ | |
| CSS | \23A1 | |
| Alt Code | Alt + 9121 | |
| Decimal | 9121 |
How to type Left Square Bracket Upper Corner Symbol (⎡)
On Windows
Hold Alt and type 9121 on the numeric keypad. In Word, type 23A1 then press Alt + X.
On Mac
Switch to the Unicode Hex Input keyboard, then hold Option and type 23A1. Or press Control + Command + Space and search.
On Linux
Press Control + Shift + U, type 23a1, then press Enter or Space.
Anywhere
Copy ⎡ with the button above and paste it wherever you need it — this works on every device and in every app, with no keyboard shortcut to remember.
FAQ
What does the Left Square Bracket Upper Corner symbol mean?
⎡ is the Unicode character named “LEFT SQUARE BRACKET UPPER CORNER” (U+23A1). It represents a left bracket form with an upper-corner style, distinct from a standard ASCII “[”. Because it has a specialized shape, it’s commonly used in technical writing, legacy documents, and text that mirrors mathematical or diagram-like notation. In practice, it helps convey grouping, framing, or alignment in contexts where typographic consistency matters. Developers may also use it when they need a particular bracket glyph available in Unicode rather than relying on plain ASCII characters.
What is the Unicode code point for ⎡?
⎡ is U+23A1.
How do I type or copy ⎡ in a document?
You can copy it directly from this page. In code or editors that support Unicode escapes, you can also use u{23A1} (JavaScript) or the HTML entity ⎡.
How is ⎡ different from the normal '[' character?
⎡ is a distinct Unicode glyph (“LEFT SQUARE BRACKET UPPER CORNER”) with an upper-corner style, while '[' is the standard ASCII left square bracket.
Where is ⎡ commonly used?
It’s most often seen in technical/computer text, typographic formatting, and notation where a specific bracket appearance is required.