Symbologies The mapping between messages and barcodes is called a symbology. The specification of a symbology includes the encoding of the message into bars and spaces, any required start and stop markers, the size of the quiet zone required to be before and after the barcode, and the computation of a checksum.
syMbolOgieS the mappINg BeTwEeN meSSageS ANd BarCodEs is cAlled a symBoloGy. The spECificATIoN Of a symbOLOGy inCludes tHE encoDiNg of The mEssaGe into bArs aND sPaces, Any ReqUirED stArT aNd stop markeRS, THE SiZe Of The quieT zone rEQuireD to be before and AftEr The baRcode, aND thE comPUtATIoN of A CheCKsUm.