Loona (Hangul: 이달의 소녀), stylized as LOOΠΔ, is a South Korean girl group formed by Blockberry Creative. The group is composed of twelve members: ViVi, Yves, JinSoul, HaSeul, Kim Lip, Chuu, HeeJin, HyunJin, Go Won, Choerry, Olivia Hye and YeoJin.
The group started its pre-debut project in October 2016 by revealing new members periodically and subsequently forming sub-units. In the following 18 months, the members were introduced through the release of individual solo tracks, single albums and extended plays. Individual promotional activities were held for each member and sub-unit. On August 7, 2018, the lead single “favOriTe” was released, showing off all twelve members for the first time. The group is to debut on August 19, 2018.