Cross-ply refers to a type of tyre construction in which the cords or plies are placed at a 90-degree angle to each other. There are several synonyms for the term cross-ply, including bias-ply, diagonal-ply and cross-ply tire. The bias-ply term is more commonly used in the US, and the diagonal-ply is more commonly used in Europe, while the cross-ply tire is a more generic term that can be used anywhere in the world. While these terms all refer to the same type of tyre construction, each of them has a slightly different connotation, and the term used will depend on the context and the audience being addressed.