From The Collaborative International Dictionary of English v.0.48 :
Signal \Sig"nal\, v. t. [imp. & p. p. Signaled or Signalled;
p. pr. & vb. n. Signaling or Signalling.]
1. To communicate by signals; as, to signal orders.
[1913 Webster]
2. To notify by a signals; to make a signal or signals to;
as, to signal a fleet to anchor. --M. Arnold.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
signaling
n 1: any nonverbal action or gesture that encodes a message;
"signals from the boat suddenly stopped" [syn: signal,
signaling, sign]