1) Plate 
In rail terminology, a fishplate, splice bar or joint bar is a metal bar that is bolted to the ends of two rails to join them together in a track. The name is derived from fish, a wooden bar with a curved profile used to strengthen a ship`s mast. The top and bottom edges are tapered inwards so the device wedges itself between the top and bottom o....
A wood or plywood piece used to fasten the ends of two members together at a butt joint with nails or bolts. Sometimes used at the junction of opposite rafters near the ridge line. 
[n] - metal plate bolted along sides of two rails or beams
noun metal plate bolted along sides of two rails or beams
A wood or plywood piece used to fasten the ends of two members together at a butt joint with nails or bolts. Sometimes used at the junction of opposite rafters near the ridge line. Sometimes called a gang nail plate.
a metal or wooden plate or slab, bolted to each of two members that have been butted or lapped together. · a joint bar.