selectorbutton
nounUK /sɪˈlɛktə ˈbʌtən/
US /səˈlɛktər ˈbʌtən/
A selector button is a button you press to pick one thing from a group.
Press the selector button to choose your favorite color.
OTHER MEANINGS
2. A physical button on a device that switches between different modes or settings.
Use the selector button on the radio to change stations.
3. A user-interface element in software that lets a user choose one option among several.
Click the selector button next to the correct answer.
4. A button on a machine that activates a chosen function or input source.
The selector button on the washing machine sets the wash cycle.