Tri-iodothyronine is a thyroid hormone responsible for regulating metabolism and energy levels in the body. It is also known as T3, triiodothyronine, triiodothyroacetic acid, and liothyronine. T3 is a critical hormone that plays a crucial role in growth, development, and metabolic functions. Synonyms for tri-iodothyronine are important for understanding thyroid disorders and are often used interchangeably in medical literature. The different names for T3 may be used in different contexts or for different purposes, but they all refer to the same hormone. It is important to differentiate between these synonyms and their uses to ensure accurate diagnosis and treatment of thyroid disorders.