303 is a name used by more than one artist.

303 (U.K. R&B trio)

303 is a U.K. R&B trio made up of Io, Maddie and Chloe. Io and Maddie, who are both from London, first perform together by singing Mario Winans and TLC songs. They later bring in Chloe, a 17-year-old from Newcastle, after she shares Drake covers online. The group forms on 30 March and takes its three-digit name from that date. Their debut single, “Whisper”, is released in November 2018.

303 (rapper)

303 is also the name used by a rapper associated with the A.J.K.S. project. The artist is also part of Energy Level Low and Bad Side of Social Existence. Under the A.J.K.S. name, the artist creates the LP Deklaracja and the EP alive:value(1), both in 2017, before changing back to the A.J.K.S. name.