Restricted area Regulation
Restricted area. A restricted area is airspace designated under Part 73 within which the flight of aircraft, while not wholly prohibited, is subject to restriction.
Also defined in 1 more source
Airspace designated under 14 CFR part 73 within which the flight of aircraft, while not wholly prohibited, is subject to restriction.
Guidance: Pilot's Handbook of Aeronautical Knowledge, p. G-25