Here are a few important names and acronyms to know:

UPC: Uniform Plumbing Code
IAPMO: International Assn. Of Plumbing and Mechanical Officials
IPC: International Plumbing Code
ICC: International Code Council
ICBO: International Conference of Building Officials (now ICC)
SBCC: State Building Code Council
TAG’s: Technical Advisory Group (consults with the legislature about code amendments)
ANSI Standards: American National Standards Institute
NFPA: National Fire Protection Association