To the left of these, work three reversed tent stitches to make a rectangular block.
Beneath this block make a stitch across two by one threads of canvas from top left to bottom right.
Structure of stitch
Identifying John stitch
A repeated pattern of one line of three tent stitches alongside one line of three reversed tent stitches, followed by a long slanted stitch (across two by one canvas threads).
Various Authors, The Royal School of Needlework Book of Embroidery (2018) , p.113