Original prints are traditionally signed in pencil by the artist. They are numbered to indicate how many prints there are in the edition and to identify the individual print. This number appears written as a fraction, for example: 34 / 75. This is called the edition number.
Electronic Product Code (EPC) A radio frequency identification code (RFID) attached to a product which contains a wide range of information unique to that item including the manufacturer, SKU, product information and serial number when applicable. This allows tracking a particular item throughout all stages of the supply chain.
EPC almost always stand for earnings per hundred clicks - in the UK too. This is supposed to be a GUIDE line, not a fact. I would not expect to get many (if any) sales in one weeks time, depending on the merchants I work with so, this depends on what products/services you promote.