BC412, also known as Binary Code 412, is a proprietary symbology developed and maintained by IBM. It is primarily used in the identification of silicon wafer distribution.
The name "BC412" comes from the fact that each character is encoded by a set of 4 bars in 12 module positions. Each bar in the symbol is the same width; the absence and/or presence of bars determines the data encoded into the symbol. Every BC412 symbol ends with a mod 35 check digit.
Each symbol begins with a start character composed of one bar, followed by two spaces. It also contains a stop character, whose structure is bar, space, bar.
The Character Set