Coopernails sign, also known as Lindsay's nails or half and half nails, refers to a medical condition that manifests as a discoloration of the nails. Instead of the usual pink color, the nails appear pearly white with a horizontal band at the tip. Synonyms for this condition include Terry's nails and leukonychia striata. Terry's nails is characterized by a similar appearance, where most of the nail is white with a narrow pink band at the tip. Leukonychia striata is another synonym, specifically describing the linear white stripes that appear on the nail plate. While these synonyms may differ slightly in appearance, all refer to abnormal changes in nail coloration, and prompt medical attention is advised if such symptoms arise.