Pound Sterling: The pound sterling is the official term for the currency of the United Kingdom. It is commonly known as the pound. It is thought to be the world’s oldest currency still in circulation. It originated sometime during the 760s when King Offa of present-day Staffordshire introduced the silver penny into the coin currency of the time. The surrounding Anglo-Saxon kingdoms also adopted it after time and it eventually became the standard monetary unit of the region.

Sources: Wikipedia, Pounds to Pocket, BBC