touchkey
nounUK /ˈtʌtʃkiː/
US /ˈtʌtʃkiː/
A touchkey is a button you press with your finger to make something happen.
Press the touchkey to turn on the light.
OTHER MEANINGS
2. A flat key on a touchscreen that works when you tap it.
She tapped the touchkey on the tablet to open the game.
3. A small sensitive pad that reacts to your finger's touch.
The door opened when he touched the touchkey.
4. A key on a device that has no moving parts.
This phone has touchkeys instead of real buttons.