Master Print
This refers to the first digital print made within some abstracts, digital art, digital collage and certain photography pieces. It might also be referred to as an artist proof because it is larger than the balance of any editions so that details well prior to size reduction. In reality it could be called the original because there is only 1.
Example: The single Master print might be 30X40 and the rest of the prints in an edition 18X24.