unlabeledbutton
nounUK /ʌnˈleɪbəld ˈbʌtən/
US /ʌnˈleɪbəld ˈbʌtən/
A button that has no words or picture on it.
The app had an unlabeledbutton that nobody knew how to use.
OTHER MEANINGS
2. A physical control with no printed or engraved marking.
The machine's unlabeledbutton confused the new operator.
3. A mystery control whose function is unknown until pressed.
He pressed the unlabeledbutton and the lights went out.
4. A design flaw where a button lacks a visible name or symbol.
The tester reported an unlabeledbutton on the checkout page.