The name normally given is the front elevation.
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Since a box is three dimensional, line symmetry is irrelevent. Planar symmetry is probably what you meant. In that case, any plane that intersects the center of the box will make either side of that box symmetric.
tan-1(MUs)= critical angle
Rectangular cuboid
other name of of rectangle is a box or rectangleprirm i hope this helped your ?????
I think it is just called the right angle symbol