Loona (written as LOOΠΔ, ; ) is a South Korean girl group formed by Blockberry Creative. The group was first shown to the public through a project which began in October 2016, where each of the twelve members were revealed one after another by releasing a single over the next eighteen months. The members have formed three sub-units: Loona 1/3, Loona Odd Eye Circle and Loona yyxy. They started as a full group with the extended play, "[+ +]" (2018), supported by the lead single "favOriTe" and the title track "Hi High."