fire-exit bolt[′fīr ‚eg·zət ‚bōlt]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
panic exit device, fire-exit bolt, panic bolt, panic hardware
A door locking device used on exit doors; the door latch releases when a bar, across the inside of the door, is pushed.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.