Imperial

The Imperial was a form of currency. When the TARDIS entered a time rift, the Doctor and Romana argued about what they should do next. When Romana facetiously made the suggestion that they should flip a coin to decide, a method with which the Doctor didn't see anything wrong, Adric took the remark seriously and flipped a 100 Imperial coin to decide whether to operate a random control on the console. (TV: Warriors' Gate)