What does NT, RR, RR7, 1st Coastal, etc stand for

[omnisophos]

NT (No Trades) means your not allowed to trade
RR (Reverse Robber) means youre not allowed to place the robber on anyone else but yourself, unless youre forced to (all your spots are joined with others)

all rules/variations can be found here:
contractbud.com/index.html?article=catanvariants

[omnisophos]

i made a TK short url to the variants page:

www.variants.tk