Like the numerals 1, 2 and 3 (6)
I believe the answer is:
arabic
'like the numerals 1 2 and 3' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arabic that I've seen before include "connected with gum" , "Language (of numbers)" , "Official language of Egypt" , "Language widespread in Middle East and N Africa" , "There's a CIA bar on this language, oddly" .)