Plain English Meaning
A marked spot on the airport where you park your plane to test whether your VOR navigation equipment is reading correctly.
Full Definition
A painted sign on an airport surface marking the exact spot where a pilot can position the aircraft and check the accuracy of the aircraft's VOR (VHF Omnidirectional Range) navigation receiver against a published bearing and distance from a nearby VOR station.
Context Anchor
Seen on some airport taxiway or ramp areas where an FAA-designated VOR receiver check is .