signal

(eg. grace, metaphor, house )

signal /ˈsɪɡ nəl/ ?

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(n) any nonverbal action or gesture that encodes a message
(n) any incitement to action
(n) an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes
(v) communicate silently and non-verbally by signals or signs
(v) be a signal for or a symptom of
(adj) notably out of the ordinary

In gay bars these days, the men's costumes, with their coded signals, are so elaborate that even habitues are beginning to get confused.
In a sense, this signal is Tacan's compass needle.
Nicolelis and his colleagues monitored the monkeys' brain signals as they warmed up for various tasks, like reaching for food, and isolated the signals that preceded the movements.

"Now this legislation moves to the Senate, and I look forward to receiving a final product that will serve as a strong signal to the executives who run these firms that such compensation will not be tolerated," Mr Obama said.
on Mar 19, 2009 By: Barack Obama Source: BBC News
"I view this report as a warning signal that they had the program and they halted the program. The reason it's a warning sign is because they could restart it," Bush said.
on Dec 4, 2007 By: President Bush Source: AHN
"In my lifetime, the United Nations has moved from being a high-minded aspiration to being a real force for common good," Elizabeth told diplomats from the 192 UN member states. "That of itself has been a signal achievement."
on Jul 6, 2010 By: Elizabeth II Source: FOXNews