⎡
⎡ LEFT SQUARE BRACKET UPPER CORNER
| Codepoint | U+23A1 |
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| Block | Miscellaneous Technical |
| Sub-Block | Bracket pieces |
| Category | Sm / Symbol, math |
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| How to type "⎡" in Windows? | hold alt type + type 23A1 release alt |
| How to type "⎡" in Linux? | hold ctrl+shift type U 23A1 release ctrl+shift |