That stands for Self Addressed Stamped Envelope, which might not help in your case, since you're outside the US. The US Postal Service has something called International Reply Coupons for US citizens to send to correspondents overseas in place of a SASE. Norway probably has something similar. Sorry if that's too much info.
I keep forgetting this is the 21st century. Mr. Ruckus will have to answer that one, though. I was just poking my nose in with hopefully helpful information.