A system and related techniques provide a platform for encoding high density geometric symbol sets, for example a triangular barcode-type of encoding which may be used to encode drivers' licenses, biometric IDs, passports, or other transaction or identification media. According to embodiments of the...http://www.google.ca/patents/US7936901?utm_source=gb-gplus-sharePatent US7936901 - System and method for encoding high density geometric symbol set
