Lattice girder, also known as truss girder, is a structural element commonly used in construction. There are several synonyms for the term lattice girder, including beam truss, steel truss, and grid girder. The term beam truss refers to the structural member being both a beam and a truss. Steel truss is self-explanatory, and grid girder refers to the grid-like appearance of the structure. Other synonyms include open web truss and triangular truss, as the structure typically has a triangular shape. Regardless of the term used, lattice girders provide reliable support in both building and bridge construction, making them a crucial component in modern infrastructure projects.