Make 1 Right (m1R)
The m1R, or make 1 right, is a right-leaning single increase that creates a new stitch from the space between two existing stitches.
To work it, use the left-hand needle to pick up the bar between the most recent stitch on the right-hand needle and the next stitch on the left-hand needle from back to front. Knit into the front of this new stitch.
The following video demonstrates how to work a m1R: