promptbutton
nounUK /ˈprɒmptˌbʌtən/
US /ˈprɑːmptˌbʌtən/
A button you press to make something happen right away.
Press the promptbutton to start the game.
OTHER MEANINGS
2. A key on a computer or device that makes a program respond immediately.
She hit the promptbutton and the screen lit up.
3. A quick-response control used in apps to confirm an action.
Tap the promptbutton to accept the message.
4. A physical switch that starts a machine without delay.
The worker pressed the promptbutton on the machine.
5. A reminder button that tells someone to do something.
The promptbutton on the timer beeped to remind him to stand up.