What does STRUCT stand for?

Structure

The way in which a tyre carcass is constructed. Radial structure tyres can be identified by the word radial or by the letter R and today account for the majority of vehicle tyres. A mechanism designed and built or constructed of various parts jointed together in some definite manner to carry loads and resist forces. As applied to a crystal, the shape and size of the unit cell and the location of all atoms within the unit cell. As applied to microstructure, the size, shape and arrangement of phases.