At least 5 single stitch lines can be used to form a French point. It is to put 5 lines of Cross (crisscross) on the other line to form a certain thickness of embroidery, which looks like a point of protruding.
The more the number of needles, the more convex the point. When embroidering lace, in order to create "loft" effect, often superimpose small French dots and slightly larger dots.
These points are usually odd needles, so that the start and stop points can fall at the same point. French dots are very effective on medium weight fabrics and lace.