Flight stairs, also known as staircase or stairway, refer to a set of steps that lead from one level of a building to another. Synonyms for flight stairs can include staircase, stairwell, steps, stairway, and flight of steps. The word staircase is derived from the Old French word "estayer," which means "to support." Staircases can be made of various materials, such as wood, concrete, or metal, and can be curved or straight. They can also have different shapes, such as spiral or L-shaped. Staircases can be found in residential and commercial buildings alike and are an essential element of architectural design.