UnitBox[x] represents the unit box function, equal to 1 for and 0 otherwise.
UnitBox[x1, x2, ...]represents the multidimensional unit box function, equal to 1 if and 0 otherwise.
Plots in one and two dimensions:
UnitBox is a piecewise function:
UnitStep UnitTriangle DiracDelta HeavisidePi HeavisideTheta HeavisideLambda
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