U+5FFE "忾" CJK Unified Ideograph-# Unicode Character

U+5FFE "忾" CJK Unified Ideograph-# is a Chinese character (Hanzi) used in both traditional and simplified writing, though it is relatively rare in modern everyday usage. Pronounced as kài in Mandarin, it primarily conveys meanings related to sighing, anger, or resentment, often appearing in classical Chinese texts to describe a deep, emotional exhalation or a state of indignation. Structurally, it belongs to the "heart" (忄) radical on the left, indicating its connection to emotions or feelings, combined with a phonetic component. In historical literary contexts, it can be found in idioms or poetic expressions, though it is not commonly encountered in contemporary Chinese language outside of specialized or scholarly works.