U+55E8 "嗨" CJK Unified Ideograph-# Unicode Character
U+55E8 "嗨" CJK Unified Ideograph-# is a Chinese character primarily used as an interjection or exclamation, most commonly encountered in modern Mandarin Chinese as a casual, friendly greeting equivalent to "hi" or "hey" in English. Its structure combines the radical for "mouth" (口) on the left, indicating its association with speech or vocal sounds, and the phonetic component "海" (hai) on the right, which suggests its pronunciation. Beyond its greeting function, it can also express surprise, summon attention, or serve as a filler in informal conversation. This character is part of the Unified Repertoire and Ordering (CJK Unified Ideographs) block in the Unicode Standard, reflecting its widespread use in Chinese, Japanese, and Korean writing systems.