Here is a list of common abbreviations in NationStates and Cosmic Islands:
or B - Bells (our currency)
10KI or XKI - 10000 Islands (region)
TP - The Pacific (region)
TEP - The East Pacific (region)
TWP - The West Pacific (region)
TNP - The North Pacific (region)
TSP - The South Pacific (region)
TRR - The Rejected Realms (region)
PM - Private Message (in-forum messaging)
TG - Telegram (NationStates international messaging)
CTE - Ceased to Exist
CI - Cosmic Islands
NS - NationStates
(T)GC - (The) Grand Council
AoN - Assembly of Nations
Co10 - Council of Ten
IC - In-character
OOC - Out of Character
CDA - Cosmic Defense Army
TITO - Ten thousand Islands Treaty Organization (regional army)
RRA - Rejected Realms Army (regional army)
FRA - Founderless Regions Alliance (alliance supported by Global Rights Alliance)
GRA - Global Rights Alliance (region/regional army)
WA - World Assembly (assembly)
CI - Comic Islands (this region)
GA - General Assembly (sub-assembly of World Assembly)
SC - Security Council (sub-assembly of World Assembly)
TBH - The Black Hawks/Hand (region/raiding organization)
GC - Grand Central (region)
GCA - Grand Central Army (raiding organization)
AWP - 00000 A World Power (region/defending organization)
LWU - Lone Wolves United (region/raiding organization)
CIRC - Cosmic islands Regional Cup (sports tournament)
More coming...