Definition of "visual signal" [visual signal]

• A signal that involves visual communication (noun)

WordNet. Princeton University. 2010.

• "To save time he decided to use 230 kcs. instead of re-tuning the set, and made a visual signal to the flagdeck telling them to warn the W/T office."
• "Lützow’s wireless had been destroyed and now, when he wanted to report Beatty’s reappearance, he could not; Scheer in Friedrich der Grosse was ten miles astern, beyond visual signal distance."