visual signals
Light-based communication methods
Visual signals are communications conveyed through sight rather than sound or touch—gestures, facial expressions, lights, flags, signs, or body language.
Animals use visual signals for mating and warning; humans rely on them constantly, from traffic lights to a raised eyebrow.
The referee's visual signals told players the call before the whistle.
- emergency flaresPyrotechnic distress signals
- eye contactDirect visual connection
- raised eyebrowFacial expression of skepticism
- bioluminescenceOrganism-generated light emission
- courtship displaysBehaviors to attract mates
holograms · logos · motion graphics · body language · hand gestures · warning coloration · animal communication · road signs · neon signs · mimicry · traffic lights · facial expressions · cues · laser pointers · headlights · high beams · indicators · camouflage
- animal signalsbody language, bird songs, tail wagging, mating calls, whale song
- signalingsemaphore, heliograph, Morse code, flags, flares
- signalssignaling, waved, nodded, gestured, blinked
- boating safetylife jackets, life vests, PFDs, fire extinguisher, fire extinguishers
- Deaflympicsdeaf athletes, signing, gold medal, silver medal, bronze medal
- flower traitspetals, nectar, pollen, anthers, stigma
visual signalsauditory signals
Perceptible tones carrying meaning
audio signals · sound signals · audio cues · auditory cues · haptic feedback