Which light indicator signifies that a pushbutton is not in its normal position?

The white light indicator signifies that a pushbutton is not in its normal position on the A320. When the white light is illuminated, it serves as an alert to the crew that the pushbutton has been activated or is in a non-normal state. This visual cue is crucial for maintaining awareness of the aircraft’s systems and ensuring that all controls are set correctly during various phases of flight. This helps the flight crew avoid potential misconfigurations that could affect the aircraft's performance or safety. The other color indicators have different meanings associated with warning, status, or operational conditions of the aircraft systems, but the white light specifically relates to the position of pushbuttons.