A "Therblig" is a fundamental unit of motion used in the study of work and efficiency, particularly in the field of industrial engineering. The term was coined by Frank B. Gilbreth and his wife, Lillian M. Gilbreth, who were pioneers in time and motion study. Each Therblig represents a specific type of movement, such as reaching, grasping, or releasing, which can be analyzed to improve productivity. The concept of Therbligs helps identify inefficiencies in tasks by breaking them down into smaller components. By understanding these movements, organizations can streamline processes, reduce waste, and enhance overall performance in various settings, including manufacturing and service industries.