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Definition 2024

[	U+005B, [ LEFT SQUARE BRACKET

Basic Latin

[

(mathematics) In set builder notation, an inward facing bracket represents a closed endpoint of an interval (an inward facing parenthesis denotes an open endpoint).
$[a,b)=\{x\in \mathbb {R} \,|\,a\leq x<b\}$ ,
(mathematics) In ISO 31-11 notation, an inward facing bracket denotes a closed endpoint of an interval and an outward facing bracket denotes an open endpoint.
$\left[a,b\right[=\{x\,|\,a\leq x<b\}$
Used in [ ].