Octagon star (pattern)
Stitch a horizontal stitch over two threads, miss two threads and then make a diagonal stitch over two intersections.
Continue across the width of the area to be filled with straight and diagonal stitches.
Return back across the area with a mirror image of the same stitches to produce a line of Xs and equals signs (=).
Working up and down the shape, stitch a vertical stitch to complete the boxes, and a diagonal stitch to connect the boxes. Additionally stitch a vertical and a horizontal over each cross to complete a star.
Structure of stitch
Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.141