Lhermitte's sign refers to a common neurological symptom characterized by an electric shock-like sensation that occurs with neck flexion. This symptom is often associated with multiple sclerosis, a chronic autoimmune disease that affects the central nervous system. There are a few other terms commonly used to describe this symptom, including Barber Chair Phenomenon, Shocking Sensation, and Lhermitte phenomenon. These terms are all synonyms for Lhermitte's sign and are used to describe the same abnormal sensation. Other neurological symptoms associated with multiple sclerosis include muscle weakness, difficulty with coordination, and changes in sensation. Identifying and describing these symptoms early on is crucial for early diagnosis and effective management of the disease.