Suppon is a stage setting for an actor to make a stage appearance from the trap cellar, and it is located on the hanamichi (an elevated runway) in kabuki (traditional drama performed by male actors) theater.
すっぽんとは、歌舞伎などの劇場にある花道上に、舞台下の奈落から、役者が登場してくるためにある舞台装置のことである。