Perpendicularity
Specifying Perpendicularity (Pin)
Specifying Perpendicularity (Hole)

This on the drawing:

Means this:

Regardless of feature size, the feature axis must lie within a cylindrical zone 0.4 diameter which is perpendicular to and projects from datum plane A for the feature height. The feature axis must be within the specified tolerance of location.

SPECIFYING PERPENDICULARITY FOR AN AXIS (PIN OR BOSS RFS)