Question: what do all the hogwarts houses mean?
Answer: Each House represents one of the four classical elements: Fire (Gryffindor), Earth (Hufflepuff), Air (Ravenclaw), and Water (Slytherin). Each of these also represents one of the four states of matter: Plasma (Fire, Gryffindor), Gas (Air, Ravenclaw), Liquid (Water, Slytherin), and Solid (Earth, Hufflepuff).