The knotted buttonhole stitch looks very much like a blanket stitch and is often used to fasten the edges of a buttonhole, since it is much stronger that the buttonhole stitch because of the knots. 

Hollie point (or holy point) is a form of flat needlepoint lace with rows of hollie stitches: knotted buttonhole stitches worked over horizontal, stretched threads. Hollie point was popular in England from the seventeenth to the early nineteenth centuries.

Hollie stitch is a form of lace stitch used to create hollie or holy point lace, which was popular in England in the eighteenth and nineteenth centuries. The stitch, according to Mary Thomas and following her description, is partially detached from the ground material and takes the form of a series of connected, small knots.

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