OPEC - Organization of Petroleum Exporting Countries
OMG - Oh My God
OAS - Organization of American States
PMG - Post master general
PIN - Personal identification number
PEI - Prince Edward island
QED - quod erat demonstrandum
QT - quality control; quiet time
QOTD - quote of the day
RSL - Returned Soldiers League
RAA - Royal Academy of Arts
RAF - Royal Air Force
SOS Save Our Skins (or Souls)
SAS Special Air Service
STD Standard Trunk Dialling
TAB - Totalizator Agency Board
TAM - Television Audience Measurement
TAT - Thematic Apperception Test
UAE United Arab Emirates
USB Universal Serial Bus
URTI Upper respiratory tract infection
VAN - value added network
VAR - value added reseller
VAT - value added tax
WEA - Workers' Educational Association (what a dated name)
WRNS - Women's Royal Naval Service
www - world-wide web
XML - extensible markup language
XXL - double extra large
XD - extra dividend
YMCA Young Mans Christian Association
YHA Youth Hostel Association
YTD Year To Date
ZZZ - sound of sleeping
ZPG - zero population growth
ZANU - Zimbabwe African National Union
Can someone else suggest the next topic please?
first word of a piece of music
Adagio for strings, Barber
(The) Barber of Seville- Gioachino Rossini [Il barbiere di Siviglia]
Carol - A song or hymn celebrating Christmas
Danses sacrés et profanes by Claude Debussy.
Hammerklavier Sonata - Beethoven