Third-person singular simple present indicative form of signal.
Elise gave a few hand signals to her detail.
In this manner the signals are read by ear.
What the hell, if hand signals and the language of smiles could do the trick, she'd make a fine employee.
In Squier and Crehore's " Synchronograph " system " sine waves of current, instead of sharp " makes and breaks," or sharp reversals, are employed for transmitting signals, the waves being produced by an alternating-current dynamo, and regulated by means of a perforated paper ribbon, as in the Wheatstone automatic system.
Elise and Dan were a good team, relaying hand signals and other silent communications with nothing more than a glance at each other.