The pound (£), also referred to as the pound sterling or quid, was the currency of England and Great Britain. It was equal to one hundred pence.
Captain Picard used the an old Earth adage, "in for a penny, in for a pound", when talking to Data and Riker about delivering a message to Data's "pen pal" in 2365. (TNG: "Pen Pals")
Kathryn Janeway used the adage when talking to the Nezu Ambassador when offering to help with a rescue attempt from an asteroid bombardment. (VOY: "Rise")