Endothelin is a signaling peptide that is produced by blood vessel cells and plays a vital role in regulating blood pressure and fluid balance. Synonyms for Endothelin include ET-1, Endothelin-1, and Endothelin A. ET-1 is a potent vasoconstrictor that causes blood vessels to narrow and increase blood pressure. Endothelin-1 is known to regulate vascular tone, cellular proliferation, inflammation, and fibrosis. Endothelin A is one of two receptors of Endothelin-1 and plays a significant role in regulating cardiovascular and renal functions. Understanding the synonyms for Endothelin is crucial in the study of its various biological functions and in the development of therapeutic interventions for cardiovascular and renal diseases.