U+545C "呜" CJK Unified Ideograph-# Unicode Character

U+545C "呜" CJK Unified Ideograph-# is a Chinese character that primarily functions as an onomatopoeia, representing a low, mournful sound such as a sob, a whimper, or the hooting of a whistle or horn. In modern usage, it conveys a sense of sadness, lamentation, or soft crying, and it can also appear in written transcriptions of similar sounds. Pronounced "wū" in Mandarin, it is found in classical poetry and everyday digital communication, often used with repetition like "呜呜" to mimic the sound of crying or the distant wail of a train.