OKAY...one of my freinds found the answer...Apprenty the actual word is "Dress Circle"
Since there are no "High End" auditoriums in Sri Lanka (eg : Royal Albert Hall), there is no specific dress code. Hence we follow an "Open Dress" policy.
So the word had come in to usage as "Open Dress Circle" - O.D.C.
So there we are...BTW this info is thanks to my good friend Channa D.
thanx for the info.... never knew that...