is perpendicularity measured in degrees
LMC or MMC can apply to feature of size of the orientation tolerances. Perpendicularity: Perpendicularity tolerance symbol is shown as â¥.Perpendicularity tolerance is a three-dimensional geometric tolerance that controls how much a surface, axis, or plane can deviate from a 90 degree angle or it is can be defined as a condition of a surface, median plant, or axis at 90 degree to a datum plane or axis.