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p...q...R...S...t...u...

Could literally be a hundred things. They made a fuss over 'Liquid Retina', so the popular consensus is 'Retina'... Personally they should've just put an 'i' at the end and ran with it, "iPhone XRi, now 50% faster around corners.".
 
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XR sounds like it's a motorcycle lol

I wouldn't have thought it would be Retina, the Retina display has been around in some form for years, but I'm probably wrong.

I'm going with "Reduced" :p
 
All iPhone displays are called Retina so it's highly unlikely the R stands for that. Probably stands for Remix :p
iPhone 8 + X = XR (Remix)
 
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