Basque knot also known as Basque Loop stitch, and Knotted loop stitch. As a stitch it can be employed singly, or scattered over an area.
They can also be worked as a textured line, as they can be easily worked joined together. The line produced is well defined as it is knotted.
Basque knot is similar to Palestrina. The main difference, as you can see from the illustrations you work the stitch from right to left, along a line instead of left to right.
This knot stitch is often seen on old embroideries in combination with Basque stitch. The stitch is worked in the same manner as Palestrina stitch only work the stitch from right to left, along a line instead of left to right. Also instead of moving diagonally behind the fabric you move horizontally.
For a single knot take the thread to the back of the fabric after you have completed the first knot.
There are a number of variations in Palestrina stitch such as Triple Palestrina, and Pearl stitch which is reversed Palestrina, Basque knot is also a variety of Palestrina. Sorbello Stitch is also an interesting variation of this stitch.