Crossword Genius

It can be written in scripts known as naskh and ruq'ah (6)

Ross

I believe the answer is:

arabic

(Other definitions for arabic that I've seen before include "Common language of Middle East" , "Language (by gum!)" , "1 [GCSE]" , "Language widespread in Middle East and N Africa" , "Correspond; last word of Othello" .)

I've seen this clue in The New York Times.
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