편모 (Single) refers to a type of cell or organism that possesses a single flagellum, which is a whip-like structure used for movement. This feature is commonly found in certain types of microorganisms, such as 조류 (algae) and 세균 (bacteria). The flagellum allows these organisms to swim through liquids, aiding in their survival and reproduction. In a broader context, the term "single" can also describe an individual entity that is not part of a pair or group. This concept is often applied in various fields, including 음악 (music), where a "single" refers to a standalone song released separately from an album.