It stands for an Arabic letter/sound. "Iraq" is not an acronym like "USA" or "UK", so the question is sort of like asking "what does the D stand for in United States"?
Iraq ends with a q
Iraq
Iraq....
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There is only one four-lettered word that ends in 'q' - Iraq.
Iraq
Iraq
Iraq and Shaq
Iraq.
Iraq
Iraq
Iraq Shaq, nickname for Shaquille.