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When you flash a peace sign at someone, you are using the substitute function of nonverbal communication.

A nonverbal medium, such as eye contact, facial expressions, gestures, posture, and body language, is used to convey messages or signals in nonverbal communication (NVC). It makes use of touch, voice (paralanguage), kinesics, distance (proxemics), physical settings, and appearance (haptics). The use of time (chronemics), eye contact, staring while speaking and listening, frequent glances, fixation patterns, pupil dilation, and blink rate are further examples (oculesics)

Learn more about Nonverbal communication here:

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