The smallest unit of queriable data in the DNS, commonly referred to by its Acronym? RR.
Each ResourceRecord has a type which gives particular meaning to its payload. These types include:
A more comprehensive list of ResourceRecords is at: http://www.dns.net/dnsrd/rr.html
InNeedOfRefactor: fold all the pages for individual ResourceRecord types into this one; none of them is long, and using "an A ResourceRecord" gives much better context for links than "an A? record".
14 pages link to ResourceRecord: