Aztec Code is a high density 2 dimensional matrix
style bar code symbology that can encode up to 3832
numeric or 3067 alphabetic characters or 1914 bytes of
data. The symbol is built on a square grid with a
bulls-eye pattern at its center. Data is encoded in a
series of "layers" that circle around the bullseye
pattern. Each additional layer completely surrounds
the previous layer thus causing the symbol to grow in
size as more data is encoded yet the symbol remains
square. Aztec's primary features include: a wide range
of sizes allowing both small and large messages to be
encoded, orientation independent scanning and a user
selectable error correction mechanism.

An Aztec code barcode is used by Eurostar, Deutsche
Bahn, Trenitalia, Nederlandse Spoorwegen, Przewozy
Regionalne, PKP Intercity, Swiss Federal Railways,
SNCF and its subsidiary iDTGV for tickets sold online
and printed out by customers. An Aztec code barcode is
used by Heathrow Express and East Coast delivered to
mobile phones and displayed on their screens, and on

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