A method of using a sensing device to read coded data is provided. The coded data is arranged in accordance with a layout having mirror and n-fold rotational symmetry about a center of rotation, where n is at least two. The layout includes n identical first sub-layouts rotated 1/n revolutions apart about...http://www.google.de/patents/US7982929?utm_source=gb-gplus-sharePatent US7982929 - Method of sensing symmetric coded tags
