If you have a key fob and have ever been curious about the circle arrow button and its function, here's what it means.

The button on your car door handle is part of the keyless entry system, allowing quick locking and unlocking once the car recognizes your key fob nearby.

Some automakers have even expanded the remote start button's functionality and/or use a different icon — that's why BMW has a diamond button on its key fob, for instance.