You can customize the pedals in several ways. For example, a left side accelerator moves the accelerator pedal to the left side. A pedal extension helps you with reach and a pedal guard prevents accidental use of the pedals. If you share the car with someone who uses the standard pedals, modifications like these are usually easy to take out and put back in as needed.
Terminology: Other common names for these pedal modifications are left foot accelerator, flip-up pedal extensions, quick release pedal extensions, pedal protection and pedal cover.