startbutton
nounUK /ˈstɑːtˌbʌtən/
US /ˈstɑːrtˌbʌtən/
A button you press to make something begin.
Press the startbutton to begin the game.
OTHER MEANINGS
2. The button on a computer or device that turns it on.
She pressed the startbutton and the computer woke up.
3. A button on a game controller that pauses or begins play.
He hit the startbutton to pause the game.
4. A button in software that begins a process or task.
Click the startbutton to run the program.