The word "谜团" is formed by combining the character "谜", meaning "mystery" or "riddle", which itself is constructed from the speech radical "讠" indicating relation to language and the component "迷" providing phonetic and semantic clues, with the character "团", meaning "group" or "mass", to create a compound where "谜" denotes the core concept of mystery and "团" conveys the sense of a collection, resulting in the meaning "a bundle of mysteries".