onbutton
nounUK /ˈɒnˌbʌt.ən/
US /ˈɑːnˌbʌt.ən/
A button you press to turn something on.
Press the onbutton to start the toy robot.
OTHER MEANINGS
2. A button that activates a feature or mode on a device.
Tap the onbutton in the app to enable the flashlight.
3. A prominent control used to begin an operation or process.
The onbutton for the machine glows green when it is ready.
4. A virtual control on a screen that starts a function.
Click the onbutton on the website to begin the video.