A gantry crane is a large machine used for lifting heavy loads in industrial settings. It is called a gantry crane because of its distinctive frame or 'gantry' structure that enables it to move cargo horizontally and vertically. Synonyms for gantry crane include portal crane, bridge crane, overhead crane, and gantry hoist. These machines are common in shipyards, container ports, and manufacturing plants, where they are used to move large containers, machinery, and other bulky items. It is essential to understand these synonyms as they refer to the same equipment and help to improve communication efficiency in different industries.