r codes

Hi all, Having thrashed about on the Internet for several hours I still can't find some definitions to some of the language used when reading about R - Codes. I'm sure these are simply enough for those experienced out there - so please help. I have a square 814m2 block - 20.12 x 40.48...

I haven't started reading yet :) http://www.planning.wa.gov.au/637.asp I'll add some notes when I finish reading