ESF's Bar Codes and More (TrueType) is a set of TrueType fonts for creating bar codes. The package includes the bar code types: 2 of 5, 2 of 5 interleaved, 3 of 9, PostNet, and UPC-A.2 of 5 is used to encode numeric data.2 of 5 interleaved lets you encode very high density numeric data.3of 9 is one of the most commonly used bar codes and offers numeric, upper case ASCII, and some punctuation.PostNet is used to print bar codes for U.S. Mail delivery.UPC-A bar code is commonly used on groceries and products throughout the United States and Canada.Also included are OCR-A and OCR-B.Each TrueType bar code comes in three different aspect ratios, so you can vary the height and width of the bars independent of each other. This lets you print bar codes with the same height, but different horizontal print densities.