Expert Opinions on 'daiin'

[Skoove]

I was wondering if anyone has links to (or could summarise) any expert opinions on 'daiin'?

I've seen that older transliterations would render it as 'dam' whilst newer transliterations render it as 'daiin' but is this just preference or did handwriting experts play a role in this? I mostly ask because I am always conflicted as whether to take 'iin' as a single glyph or three glyphs 

Thank you all!