"Ab" is a common abbreviation that can stand for various terms depending on the context. In academic settings, it often refers to the Bachelor of Arts degree, which is an undergraduate program focusing on liberal arts, humanities, and social sciences. In medical contexts, "ab" can also denote antibody, a crucial component of the immune system that helps fight infections. Additionally, "ab" is used in fitness to refer to the abdominal muscles, commonly known as "abs." This term is frequently seen in workout routines and health discussions, emphasizing exercises that target the core area of the body for strength and definition.