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I am looking for a way to describe in detail an Arabic 3 (٣) http://digs.by/dmKpa9 but I do not know the proper typography terminology. I have been trying to find a way to describe the difference between the top of the ٢ and ٣ basically the difference between one looking like a U and other a W.
Do you have some resources or refences/cheat sheets that you can point me to?