The International Cooperative Ataxia Rating Scale (ICARS) is a tool used to measure the severity of ataxia, a neurological condition that affects movement and coordination. There are several synonyms for ICARS, including the Ataxia Grading Scale, the Scale for the Assessment and Rating of Ataxia (SARA), and the Brief Ataxia Rating Scale (BARS). These rating scales are designed to assess the degree of ataxia in patients with various types of neurological disorders, including cerebellar ataxia, multiple sclerosis, and Parkinson's disease. The use of ICARS and its synonyms is essential for clinicians and researchers in accurately assessing the severity of ataxia and monitoring its progression over time.