pyrotechnic code

pyrotechnic code

[¦pī·rə¦tek·nik ′kōd]
(communications)
Significant arrangement of the various colors and patterns of fireworks, signal lights, or signal smokes used for communication between units or between ground and air.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.