U+766B "癫" CJK Unified Ideograph-# Unicode Character

U+766B "癫" CJK Unified Ideograph-# is a Chinese character that primarily means "madness" or "insanity," often used in medical or emotional contexts to describe a state of mental disturbance or epilepsy. It combines the radical for disease (疒) with the phonetic component "颠" (diān), which suggests a top or peak, alluding to extreme or erratic behavior. This character appears in terms like "癫痫" (diānxián) for epilepsy and "疯癫" (fēngdiān) for crazy or demented, reflecting its strong association with neurological conditions rather than casual insult. As part of the CJK Unified Ideographs block, it encodes a concept deeply rooted in Chinese medical and literary traditions, where it conveys both literal illness and metaphorical derangement.