The Chinese word **交集** (jiāojí) is a compound term formed by combining two characters: **交** (jiāo), meaning "to intersect," "to cross," or "to mingle," and **集** (jí), meaning "to gather," "to collect," or "a set." Literally, it describes the mathematical concept of the **intersection of sets**, where elements common to multiple groups converge. Figuratively, this logical idea is extended into everyday language to express the state of **mixed or intermingled emotions** (such as joy and sorrow occurring simultaneously), capturing the essence of two or more distinct things—whether concrete sets or abstract feelings—coming together and overlapping at a common point.