The term 'Ouija Board Reply' refers to the answer given when using a Ouija board. A Ouija board is a flat board marked with the letters of the alphabet, the numbers 0-9, and the words 'YES' and 'NO'. Participants place their fingers on a planchette, a small heart-shaped piece of wood, and ask questions. The planchette then moves around the board, spelling out answers to the questions. The answer to the question is usually 'YES', which is three letters long.