obstruction marker[əb′strək·shən ‚märk·ər]
A marker indicating the presence of an obstruction.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
Objects of approved shape and/or color indicating areas and obstructions forming potential hazards to aircraft. See obstruction.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved