Actually Cease & Desist. We all wish it was Dismissed!
TLA = Three Letter Acronym
LLL = Letter Letter Letter domain as in ABC.com
NNN= Number Number Number domain as in 123.com
LNL= Letter Number Letter domain as in R4T.com
GD = Godaddy, Great Domains, or a swearing expression referring to any registrar who screws up depending on context
DNOA = Domain Name Owners Association
I think premium refers to the asking price rather than the quality in many cases.
sTLD - Sponsored TLD (you generally have to be a member of some sponsoring organization to register) includes .aero, .coop, .museum, .jobs, etc.