Various devices have been devised to hold a bike still to facilitate working on it, and they are usually called stands.
Stands may be either portable (light and collapsible) or fixed (heavy, usually attached to the floor, wall, or bench).
Care must be taken with clamping stands not to clamp a part of the bike that cannot withstand the pressure, such as the tubes of many aluminum or carbon fiber frames, and non-cylindrical carbon fiber seatposts.
They are usually made of metal or plastic and can support the weight of the bicycle while lifting it up to save space.
They are usually made of wood, plastic or metal and can protect bicycles from weather and sun damage.