This type of stitch is normally used for free-style embroidery.
GVE
Chain Stitch with Single Spike
Schematic drawing of the chain stitch with single spike.
Drawing by Martin Hense.
The chain stitch with single spike is a variation on a chain stitch, whereby an extra step is included in order to create a single spike that comes out of one side of the chain stitch. This spike can be vertically, horizontally or diagonally worked. It may also be worked on alternating sides of a series of chain stitches, and so forth.
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Embroidery stitches