Knit 1 through back loop
K1tbl or K1 tbl or K1b
Most commonly k1tbl, these stitches all do the same thing. They all knit in the back of the loop to produce a twisted type of knit stitch. This forces the normal V look to the stitch into a Y and is stretchier.
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P.S. For loom knitters you will already know this stitch as the E-wrap stitch. When you spy this abbreviation, k1tbl or others above, in a needle pattern just use your e-wrap stitch. Hope this helps!