Code 39 Barcodes Code 39 barcode is one of the most widely and commonly used barcode types. It is a linear or 1d barcode that slices perpendicularly across the bars of the barcode and is also known as USS code 39, code 3 of 9, Alpha 39, USD-3, and Type 39. A 1D barcode means that they create it with single lines without any intersection. Code 39 is capable of encoding all the alphanumeric characters [...]