Bullion knots is a kind of stitch used in hand embroidery. This embroidery stitch have been used in many forms of embroidery through the ages and have been known by various names. These include grub stitch, caterpillar stitch, coil stitch, knot stitch, post stitch, roll stitch, worm stitch and Porto Rico rose.
This stitch is formed by working an incomplete backstitch, leaving the needle in the fabric. It is vital that the point of the needle exist from the hole where it started.