in traditional rugs, the term “Oriental” refers to the location where the rug was woven, in this case it means Asia. So, in a nutshell, all Persian rugs are also Oriental rugs. That said, not all Oriental rugs are Persian as many were woven in other places outside of Persia.
The “traditional” Persian carpet is tied with a single looping knot, known as Persian or Senneh knot. The vertical strand of thread in a Persian carpet has one loop. This use of a single knot is essential in establishing the identity of the place where the rug was made and can sometimes help in identifying the artisans who made it. When comparing carpets, the way to identify the knot used is to splay open the pile by bending the rug against itself and looking at the base of the knot.