In Daniel 5, what appeared and wrote on the wall during the king's great feast?

Answer: The fingers of a human hand

The fingers of a human hand appeared and wrote on the plaster of the palace wall, near the lampstand, as the king watched.

“At that moment the fingers of a human hand appeared and wrote on the plaster of the wall, near the lampstand in the royal palace. As the king watched the hand that was writing,”— Daniel 5:5 (BSB)