Perpendicular

Relationship between two lines that meet at a right angle (90 degrees)

In geometry, two geometric objects are perpendicular if their intersection forms right angles at the point of intersection called a foot. The condition of perpendicularity may be represented graphically using the perpendicular symbol, ⟂. Perpendicular intersections can happen between two lines, between a line and a plane, and between two planes.

This keyword could refer to multiple things. Here are some suggestions: