Finger

A finger was a manipulatory appendage on a hand.

The First Doctor wore a signet ring on the middle finger of his right hand, (TV: An Unearthly Child) He discarded it after his regeneration, though, as it no longer fit him. (TV: The Power of the Daleks)

In 1978, the Harlem Globetrotters taught the Doctor how to spin a basketball on his finger. (PROSE: Dark Horizons)