Usually jib arms are attached to a vertical mast or tower or sometimes to an inclined boom. In other jib-less designs such as derricks, the load is hung directly from a boom which is often anomalously called a jib.
Bridge cranes and gantry cranes can move on three axes, two perpendicular axes and one vertical, for a versatile operational range. This range can span a narrow corridor and be used for one particular process, or it can span the entirety of your facility and be used for any material moving requirements for any process. More traditional jib cranes can operate with 360 degree rotation around a central locus.
- James T. Frane Craftsman's Illustrated Dictionary of Construction Terms 1572180080 1994 p83 "crane jib -an extension at the top of a crane tower that gives the crane additional lifting or moving capabilities. There are different types of jibs. A saddle jib is a horizontal extension, at a right angle to the tower, with a hook attached to a trolley."
- Collins English Dictionary 
- An Encyclopaedia of Civil Engineering, Edward Cresy (1847) "The gib of a crane should always revolve wholly round its axis, and be able to deliver the load at any point of the circle described by the axis of the gib"
- "Overhead Equipment: Benefits of Cranes & Hoists". American Crane. Retrieved 2019-02-01.
- Scott Schaefermeyer Digital Video Basics 1418865133 2012 p109 "A jib arm is basically a small crane that holds nothing but the camera. Large jib arms require somebody to move and control the jib while the camera operator controls the camera. "