Trim marks of equilateral triangular shape

Trim marks for a page to be severed along a trim line to form a sheet containing indicia to be read automatically by sensors aligned a fixed distance from a severed edge of said sheet, said trim marks comprising:

• a first set of equilateral triangles printed on said page on one side of the desired trim line, each triangle in said first set being oriented with one corner along said trim line and one side adjacent said corner extending perpendicular to said trim line, so that the side opposite said one corner is parallel to said trim line but spaced therefrom, the length of said one adjacent side being equal to the maximum acceptable trim tolerance for severance offset in the direction of that first set, and
• a second set of equilateral triangles printed on said page on the opposite side of the desired trim line, each triangle in said second set being oriented with one corner along said trim line and one side adjacent said corner extending perpendicular to said trim line so that the side opposite said one corner is parallel to said trim line but spaced therefrom, the length of said one adjacent side being equal to the maximum acceptable trim tolerance for severance offset in the direction of said second set, whereby when said page is severed exactly on said trim line, only the corner points of said triangles are visible at the severed edge of said sheet, and whereby when said page is severed off said trim line but within tolerance, the width of the truncated triangle visible at the severed edge of said sheet corresponds exactly to the amount of offset of the severed edge from said trim line.