Disclosed is an identification symbol and system and method for reading in accordance with the present invention is preferably a two-dimensional, rectangular or square bar code symbol having a solid border, a tick-mark region adjacent to the solid border, a omni-directional reading and error detection...http://www.google.de/patents/US8152070?utm_source=gb-gplus-sharePatent US8152070 - Two-dimensional symbol and method for reading same
