3RACHA was started when they were still trainees and involved them producing and releasing rap songs as the trio 3RACHA online. Stray Kids was not a thing then so it was not a teaser for Stray Kids, just a separate project for them as trainees. Once Stray Kids debuted those three took over as the groups main producers and writers. The name then became used as the subunit name for the three of them, and is meant to be the rap, production, and writing uni.They don’t release songs as 3RACHA anymore, and the songs they released as trainees haven’t been officially released anywhere except on Souncloud. However they have released one song (3RACHA) as a trio. All of the other subunits of Stray Kids were named in the same style (Danceracha, Vocalracha), but only 3RACHA was an actual project before debut.