"Detonation" is the organization name. "FocusMe" was originally the name of the separate League team that they had picked up, but ended integrating it to the brand.
FUT is originally known as Futbolist, but they ended up shortening it.
I don't think we even known what T1 means. I've seen people say it's "team one", others say it's just "telecom one", and then a few say it stands for Digital Signal 1, which can be abbreviated to T1