What ensign, used by Parliment during the Fifties, Sixties, and Seventies in Northern Ireland, was also used to represent Northern Ireland at the 2010 Commonwealth Games?
Northern Ireland at the 2010 Commonwealth Games: Northern Ireland was represented at the 2010 Commonwealth Games by the Commonwealth Games Council for Northern Ireland. Flag of Northern Ireland:  From 1953 until 1973, the Ulster Banner (also known as the Ulster flag) was used by the Parliament of Northern Ireland; however, since its abolition use of the flag has been limited to representing Northern Ireland in certain sports, at the Commonwealth of Nations, at some local councils and at some other organisations and occasions.
the Ulster Banner