The Full Meaning Of CON are;

CON Commonwealth of Nations
CON Champions of Norrath (game)
CON Conservatorium of Music
CoN Call of Nature
CON Coniunx (Latin: Consort)
CON Certificate of Networthiness (USAF system certification)
CON Chips on the Net
CON PeakSimple Control (file extension)
CON Computer Output Notification
CON Constraint Oriented Notation
CON College of Nursing (various locations)
CON Creatures of the Night