vector gunsight

vector gunsight

[′vek·tər ′gən‚sīt]
(ordnance)
A gunsight that contains a device that computes the vector required for the bullet to follow if it is to strike its target; used especially in firing at moving targets.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.