The mark consists of The mark consists of a three dimensional configuration of an RFID reader comprising a housing having a generally quadrangular front face and a plurality of side surfaces connected to the front face. The front face defines a rounded peripheral edge which transitions into the plurality of side surfaces, and further includes a generally quadrangular groove. The front face additionally includes six long grooves in vertical alignment with each other and a short groove disposed below the uppermost long groove. The front face further includes a generally quadrangular recess and an indicator light disposed along a common horizontal axis with the short groove. Six rounded depressions are formed within the front face and are aligned along a common vertical axis with the indicator light and are horizontally aligned with respective ones of the long grooves. The matter shown in broken or dotted lines is not part of the mark and serves only to show the position or placement of the mark.