In the photo above you can see the types knots that are :
The first row
a. Turkish knots b. Persian knots open to the right c.Persian knots open to the left
Second row
B. different warp levels C. Spanish knot
The third row
D . Variations of Turkish and Persian knots
source : The secret of the most elegant and precious rugs in the world
Dr Reza hekmat-nejad
Oriental & Persian Rug Cleaning & Repair Los Angeles County 
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