Abstract: A marker for separately indicating a plurality of related materials comprising a base plate including a first section having at least one numeral row circularly arranged thereon and a second section having an area on which a plurality of predetermined items are printed. A plurality of pointers are rotationally situated in the center of a first section of the base plate, and an indicator is situated in a second section of the base plate. The indicator includes a guide groove extending through the area where the printed items are indicated, and a plurality of sliding pins slidably situated in the guide groove to immovably point the items when required. The pointers are independently moved relative to each other without influencing the other pointers and are marked to be distinguished from each other. The sliding pins of the indicator are marked to correspond to the pointers respectively for recording necessary information by mutual cooperation.