Face signal | Article about face signal by The Free Dictionary
face signal[′fās ‚sig·nəl]
A wire stretched along the face and connected to a panel near the main gate to control the running of a face conveyor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive
The mere shine of a gun barrel or an uncamouflaged white face signal
them to abort landing.
It's not known whether a cute face signals
an advantage for a baby, Gangestad notes, or whether mothers who invest special effort in raising cute babies reap big dividends later.