Hook hands. "Its hand shape: the five fingers are close together in turn, the back of the thumb is upward, the other four fingers are slightly bent towards the palm, mainly the little finger, and the wrist is bent into a hook along the palm edge of the little finger. This hand is characterized by no obvious hook tip, but the fingertips of the four fingers are serrated, so it is also called "serrated hook hand" (see Figure 2).