Complement H, also known as C3b-inactivator or beta-1H globulin, plays a significant role in the body's immune response against unwanted substances. However, there are certain situations where we might want to describe this important protein using different terms. Synonyms for Complement H include C3 inhibitor, C3b-sensitive factor, and third pathway control protein. These names highlight the role this protein plays in inhibiting the activation and amplification of the complement system. Regardless of the terminology used, understanding the functions and importance of Complement H remains crucial when studying the immune system and its response to various diseases and infections.