A building supporter is a type of structural element used in construction. It is also known as a JOIST, which is a five-letter word that can be found in crosswords. Joists are horizontal beams that support the floor and ceiling of a structure. They are typically made of wood, steel, or concrete and are placed parallel to each other in order to provide support for the weight of the structure. Joists are an essential part of any building's support system and are necessary for the safety and stability of the structure.