[EricH]

Originally Posted by ctt956

I see. Another 1960s reference? And a reference to "square"? Interesting. Has there ever been an "L7" in a FIRST game manual?

As far as I'm aware, nope. At least not in a rule.

Rules prefixes:
G: Game. Rules of play. What the ref is waving a flag about.
R: Robot. How you are supposed to build your robot. Why the inspectors won't pass you.
S: Safety, no longer used. (Now the first section of G and R, using those prefixes.)
T: Tournament. Overarching rules of the tournament.