Code 128 is often referred to as GS1-128 (formerly UCC/EAN-128), which is a widely supported application standard in the shipping and packaging industries. Code 128 is a linear, or one-dimensional (1D) barcode. This means the barcode is composed of a single set of varying width vertical lines and spaces.Does Code 128 C only encode numbers?
Code 128-C is a much more dense barcode, designed to print specific "types" of number strings in smaller spaces because it creates a smaller (less wide) barcode. You can only encode numbers , and they are done in 2-digit pairs; so you're not really encoding 0-9, you're actually encoding 00 - 99.