Jetsam – Goods from a ship’s cargo or parts of its equipment that have been thrown overboard to lighten the load in time of danger or to set a stranded ship adrift.

Joint Venture – A term of business partnership involving joint management and the sharing of risks and profits between enterprises sometimes based in different countries.

Jones Act – An act of the U.S. Congress prohibiting foreign flag carriers from participating in the U.S. intercoastal trade by water. It currently is applicable in such trade lanes as the U.S. continental states to and from Hawaii and Alaska.

Just in Time (JIT) – The principle of production and inventory control in which goods arrive when needed for production or use.

J&WO – Jettison and Washing Overboard.