The term 'board with a planchette' is referring to an Ouija board. An Ouija board is a flat board marked with the letters of the alphabet, the numbers 0–9, the words 'YES', 'NO', 'HELLO' (occasionally), and 'GOODBYE', along with various symbols and graphics. It is used as a divination tool, with a planchette used to spell out messages. The planchette is a small heart-shaped piece of wood that is used to point to the letters and numbers on the board.