"Per curium" is Latin for "by the court." It distinguishes court opinions written by the whole court, as opposed to those written by a single judge or justice.
The Latin phrase "per curiam" means "by the court". When a court which is composed of a panel of judges delivers a unanimous judgement, one judge will deliver an opinion "per curiam". The use of the phrase "per curiam" without the space between the words and in an adjectival as opposed to adverbial sense (as in the question) is not current worldwide, but may have a local use somewhere.