指頭 is read as しとう (shitou) and means fingertip.
しとう
shitou
じんとうしき
taking command of a corps in a battle
ゆび
finger
しじ
instructions
してい
designation
さしず
directions
さす
to extend one's arm straight ahead (in dance)
しめい
calling on
しすう
index
ゆびきり
pinky swear (i.e. linking little fingers to confirm a promise)
ゆびさす
to point at
さししめす
to indicate
ゆびさき
fingertip