What does RS stand for?

Please tell me. I really want to know

I think it stands for Red Stari, but don't take that for the absolute truth
Like how CG is Celestial Guardians and SN is Senko Nation

It is one of the tags for the Pro League, RS being for Red Stari FC, same case for SN (Senko Nation), CG (Celestial Guardians) and PLA (Pro League Academy, which was the 4th team for the Amateur Cup)

That is correct, but it's been bothering me. Why isn't it RSFC? Just because RS looks and sounds better?

EDIT Max-Bros : Because it would be too long I think, the only 2 cases of tags that were not in 2 letters were Red Bull Racing, team of season 2 (RBR) and Chomp Army, team of season 3 (POG)
After that it's only my opinion, not that of Ryubix, the organizer of the Pro League and captain of the RS

IlluZhion and Max-Bros told me.
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