touch-free gesture
nounA touch-free gesture is a way to control a device by moving your hand in the air without touching it.
She changed the song with a touch-free gesture, waving her hand over the speaker.
OTHER MEANINGS
2. A hand movement used to operate a screen or machine from a distance, often detected by cameras or sensors.
The museum's touch-free gesture display let visitors flip through photos by swiping in mid-air.
3. A body movement recognized by a system without physical contact, used for accessibility or hygiene.
In the hospital, doctors used touch-free gestures to view X-rays without touching the screen.
4. A command made by waving or pointing that a smart device understands through motion sensors.
He turned up the volume with a simple touch-free gesture in front of the TV.