visual signal

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a signal that involves visual communication
• Hypernyms:
signal, signaling, sign
• Hyponyms:
watch fire, light, red light, warning light, flare,
flash, flag, signal flag, windsock, wind sock, sock,
air sock, air-sleeve, wind sleeve, wind cone, drogue, post,
stake, blinker, turn signal, turn indicator, trafficator, armband,
armband, skyrocket, beacon, beacon fire, stoplight,
brake light, barber's pole
• Part Holonyms:
visual communication