Square
A four-sided plane figure whose sides are all the same length, whose opposite sides are parallel, and whose angles are all right angles.
Aviation Maintenance Technician Handbook — Airframe, p. G-33
Taught in GEN-D Hands-on, GEN-H Procedures, AF-A Procedures, GEN-D Procedures, AF-A Hands-on, GEN-E Hands-on and 2 more.