Very easy to knit mirrored stockinette triangles. This is a reversible stitch that looks as good on the wrong side as it does on the right side.
Cast on a multiple of 7 stitches.
Row 1 - right side: * Knit 6, purl 1; repeat from * to end.
Row 2: * Knit 2, purl 5; repeat from * to end.
Row 3 - 4: * Knit 4, purl 3; repeat from * to end.
Row 5: * Knit 2, purl 5; repeat from * to end.
Row 6: * Knit 6, purl 1; repeat from * to end.
Row 7: * Purl 1, knit 6; repeat from * to end.
Row 8: * Purl 5, knit 2; repeat from * to end.
Row 9 - 10: * Purl 3, knit 4; repeat from * to end.
Row 11: * Purl 5, knit 2; repeat from * to end.
Row 12: * Purl 1, knit 6; repeat from * to end.
Repeat Rows 1 – 12.

Mirrored Triangle stitch in the round