The mark consists of a three dimensional, visible configuration of a three hole grab folding step and bracket. The step is a three dimensional, visible configuration of a clover-leaflet shaped, upwardly facing, stand-on zone bordered by a relatively thin rim defined by a pair of substantially straight side surfaces that angle toward each other as they extend rearwardly from a curved front surface of the rim which joins smoothly with the two side surfaces of the rim, and having three elongate, rounded-end slots that open upwardly through the stand-on surface including two straight-sided elongate slots of substantially equal length and width each spaced inwardly from and extending substantially parallel along a different one of the side surfaces, and a curved elongate front slot spaced inwardly from and extending along at a substantially constant distance from the front surface. The bracket is a three dimensional, visible configuration that includes a middle portion that terminates into a vertical upper end portion. The middle portion includes parallel side surfaces and a front surface that convexly curves upwardly. The upper end portion includes a lower portion with parallel side surfaces and a triangular shaped upper portion in which the side surfaces angle toward each other in the upward direction. A circular opening is formed in the upper end portion.The broken lines in the drawing are for location purposes only and are not claimed as a feature of the mark. The lining that is shown in the mark on the drawing is not a feature of the mark, does not indicate color, and merely represents shading.