right twisted stitch
RT is a right twist, and creates a twisted stitch that leans to the right.
Let’s take a look : knit 2 stitches together as you would normally, but don’t drop the original stitches off your left needle. Now twist your right needle and go back into that first stitch on your left hand needle. Separating them with your index finger nail can help. Draw that loop up between the first and second stitch and now you can take the original stitches off your left needle.