A tripod is a device, which consists of three legs.

Overhead crane is used for lifting loads and transport to another location
An overhead crane, commonly called a bridge crane, is a type of crane found in industrial environments. An overhead crane consists of parallel runways with a traveling bridge spanning the gap. A hoist, the lifting component of a crane, travels along the bridge. If the bridge is rigidly supported on two or more legs running on a fixed rail at ground level, the crane is called a gantry crane or a goliath crane.

A differential hoist is made with two sheaves on the upper block and one sheave on the lower block

Industrial fork-lift is a four-wheeled vehicle used for material handling. A forklift is a powered industrial truck used to lift and move materials over short distances.