This is a raised right hand, with the palm facing forward and the five fingers slightly apart, which can mean raising your hand to signal to stop, stop, or high-five when you say hello or happy. In many other platform images, the five fingers are close together. Corresponding to the right hand
✋🏼 is the left hand
🤚. Putting it together can also mean high-five with both hands. Related emojis:
👐🙌🤲.