Here is another acronym for you. Do you mean OEM?
I see this acronym a lot when looking for electronic items. I think it means Original Equipment Manufacturer.
My take on the acronym is this: If a big company, like Dell or HP buys in bulk from the manufacturer, they get those items at a discounted price. So, if they need 10,000 copies of MS Windows or some SD Cards or Ram, they get a great deal and the manufacturer does not have to provide the consumer packaging that we see at the store.
So, if I am buying an OEM software item, I won't get the box, just the CD, but it will be a full version with the CD key and all. When I buy an OEM SD card, its the same card that I would buy at Office Depot but it comes in the little plastic case only and none of the retail packaging that you would get at Office Depot is included.