The word **谜团 (mítuán)**, meaning "enigma" or "tangled mystery," is formed through a semantically descriptive compound where the first character **谜 (mí)**, meaning "riddle" or "puzzle," is modified by the second character **团 (tuán)**, meaning "ball," "mass," or "something round." Together, they create a vivid metaphorical image of a mystery that is not just a single question, but a tightly wound, ball-like cluster of intertwined uncertainties and obscurities, thus conveying a sense of complexity and something that is difficult to unravel or see through clearly.