Unsupported titles/`lsqb`

[	U+005B, [ LEFT SQUARE BRACKET

Character variations

⎡	U+23A1, ⎡ LEFT SQUARE BRACKET UPPER CORNER

⎢	U+23A2, ⎢ LEFT SQUARE BRACKET EXTENSION

⎣	U+23A3, ⎣ LEFT SQUARE BRACKET LOWER CORNER

﹇	U+FE47, ﹇ PRESENTATION FORM FOR VERTICAL LEFT SQUARE BRACKET

［	U+FF3B, ［ FULLWIDTH LEFT SQUARE BRACKET

Translingual

[

(mathematics) Denotes a closed left endpoint of an interval.
$[a,b)=\{x\in \mathbb {R} \,|\,a\leq x<b\}$

$\left[a,b\right[=\{x\in \mathbb {R} \,|\,a\leq x<b\}$
(mathematics) Denotes an open right endpoint of an interval.
$\left[a,b\right[=\{x\in \mathbb {R} \,|\,a\leq x<b\}$

$\left]a,b\right[=\{x\in \mathbb {R} \,|\,a<x<b\}$
Used in [ ].