His fingers are characterized by a low 2D:4D digit ratio (= short pointer finger + long ring finger) and a long pinky finger.
Historically, the long ring finger has been recognized as a typical characteristic
of musicians: 'music is in the ring finger'.
(Check out in the next section below Tom's unusually short heart line in his left hand!)
Thom Yorke's left hand:
Thom Yorke appears to have a very short heart line in his left hand - but a study of the details reveals that the small line below his pinky finger likely the second part of a 'broken' heart line.
MORE THOM YORKE THUMBS:
FIND MORE SIMIAN LINE HOLDERS!
FIND MORE CELEBRITY HANDS!