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1. (mathematics) Denotes a closed left endpoint of an interval.

   ${\displaystyle [a,b)=\{x\in \mathbb {R} \,|\,a\leq x<b\}}$ 

   ${\displaystyle \left[a,b\right[=\{x\in \mathbb {R} \,|\,a\leq x<b\}}$ 

2. (mathematics) Denotes an open right endpoint of an interval.

   ${\displaystyle \left[a,b\right[=\{x\in \mathbb {R} \,|\,a\leq x<b\}}$ 

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

3. Used in [ ].

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•   Bracket on Wikipedia.Wikipedia