The two most used knots in Persian weaving are the Turkish and Persian knots.
Turkish knots are in the Caucasus, Kurdistan, Turkey and East Turkmenistan. The Persian knots are in Turkey, Pakistan, Egypt, China and India.
The Turkish knot - Pass between two neighboring warps. Then loop under one, wrapped around both, then pulled through the center. Both ends will come out between the two warps.
The Persian knot - This one is in finer rugs. It is much smaller than its counterparts. Wrapping around one warp, then passing behind the neighboring warp. It divides the two ends of yarn, makes the knot.
Double Knotted: The second knot sits in front of the first knot. With the double knot technique, the second knot is not visible from the back.