Pillion

A pillion is a mostly British English term for a secondary pad, cushion, or seat behind the main seat or saddle on a horse, motorcycle, or moped.[ A passenger in this seat is said to "ride pillion" or may themselves be referred to as a "pillion." The word is derived from the Gaelic for "little rug," pillean, which is itself from the Latin pellis for "animal skin." One or more pelts would often have been the form a secondary seat took on horseback, and the usage was carried over to motorcycles.