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Side note: Daesh is an acronym in Arabic, similar to ISIS

But is it an acronym in the sense of D.A.E.S.H. or, is it a phonetic transliteration in the way "You-Essay" could spell out a three letter acronym.

Are the letters of the acronym DAH & ESH?

It's an acronym in the sense of D.A.E.S.H.

No, each letter of the acronym is it's own word.