gantry
gan.try \'gan-tre-\ n [perh. modif. of ONF gantier, fr. L cantherius trellis] 1: a frame for supporting barrels 2a: a platform made to carry a traveling crane and supported by towers or s ide frames running on parallel tracks; also : a movable structure with platforms at different levels used for erecting and servicing rockets before launching 2b: a structure spanning several railroad tracks and displaying signals for each