An Acronym for Request For Comments
Internet Standards, Information, Best Common Practises, and other related stuff. Heavy reading, but if you want to know how the Internet works, there is no other way.
Also has some humorous ones, like 
RFC:1149 or HTCPCP/RFC:2324.
Of particular interest is the Best Current Practice sub series: 
BCP
Wiki handles RFCs, to refer to an RFC like so, RFC:1918, just type !RFC:1918
9 pages link to RFC:
