Compass rose

A location on an airport where an aircraft can be taken to have its compasses “swung.” Lines are painted on the rose to mark the magnetic directions in 30° increments.

Aviation Maintenance Technician Handbook — Airframe, p. G-8

Also defined in 1 more source

A small circle graduated in 360° increments, to show direction expressed in degrees.

Pilot's Handbook of Aeronautical Knowledge, p. G-7