Letter: Phototypesetting Size Chart, Point Size Chart & Leading Chart (Set of 3) The size of characters in electronic typesetting is displayed in "points," so the point size chart and leading chart are essential for those involved in electronic typesetting. It corresponds to phototypesetting sizes up to 100-point, and includes all points used in metal type. This is a set of three charts: two point size charts and one leading chart (A4 size).