"T-head" refers to a type of engine with a T-shaped combustion chamber. Some synonyms for this term include "crosshead," "T-shaped engine," or "T-cylinder engine." Another possible term is "T-head design," which highlights the unique shape of the engine's combustion chamber. These engines were commonly used in early automobile manufacturing, but have since been replaced by more modern engine designs. Despite this, the term "T-head" is still used by car enthusiasts and historians to refer to this specific engine type. In short, "T-head" has several synonyms, all of which highlight the distinctive T-shaped combustion chamber found in these engines.