The need exists to identify the data carrier a reader detects in autodiscrimination environments. The Symbology Identifier concept provides a standardized way for a device receiving data from a reader to differentiate between the data carriers. This specification deals mostly with bar code symbologies, therefore the terms Symbology Identifier, symbology, and bar code are used throughout the document but they are intended to apply to other data carriers as well. This identification is achieved by the addition of an optional feature to readers enabling the reader to prefix a standard string of characters to data messages. This preamble contains information about the decoded symbol (or other data carrier) and in some cases specific processing the reader has done. The information is not explicitly encoded in the symbol, but is detected by the reading equipment. This standard should be read in conjunction with the relevant symbology specifications.

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