Delbets sign, also known as the Clark's sign, is a medical term used to describe a specific clinical manifestation. This sign refers to the presence of a groove or depression on the lunula, the crescent-shaped area at the base of the fingernail. While synonymous terms for Delbets sign may not commonly exist, medical professionals may sometimes use alternative descriptors. This includes Nail Pitting, which refers to the small, shallow depressions or pits on the nail plate. Additionally, Onychoschizia, or nail splitting, is another term used to describe thinning or splitting of the nail, which may sometimes be present along with Delbets sign. These varying terms collectively contribute to the understanding and diagnosis of certain nail abnormalities.