This is a decorative version of the arrow head stitch. Again, it can be used to creative beautiful out linings or borders.

You need to know the arrow head stitch to be able to continue with this tutorial.

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Fig 1: Make a horizontal row of arrow head stitches.   Fig 2: Now, bring the needle out with a contrasting thread, from one end, as shown. Pass it under the two arrow head stitches as in the picture.
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Fig 3: Turn around and pass it under the two arrow head stitches and the next stitch, as illustrated.   Fig 4: Repeat the process for the rest of the row.
arrow_head_threaded_stitch_5   Fig 5: A finished row looks like this. Each angle of the arrow head stitch would be circled by the contrasting thread that was woven around it.