Loona (stylized as LOOΠΔ) is a South Korean girl group formed by Blockberry Creative. Its twelve members were revealed in a periodic fashion, corresponding to their Korean name Idarui Sonyeo (이달의 소녀), which translates to "Girl of the Month".Loona commenced their pre-debut project in August 2016, with each member releasing a promotional single over the next eighteen months.[1] The group has formed three sub-units: Loona 1/3, Loona Odd Eye Circle and Loona yyxy. Their debut EP as a full ensemble, [+ +] (2018), was supported by the lead single "Hi High".