A graphical indicator provided on the surface of an object to represent index information includes a content part and a header part. The content part is spread with a plurality of micro-units and divided into a plurality of state zones. Each state zone is spread with one micro-unit and equally divided into multiple hypothetical sections. The micro-unit is placed in any of the hypothetical sections to form different candidate states. The header part is spread with a plurality of micro-units that are specifically arranged to provide header information used to recognize the graphical indicator.
