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what does the s in iphone 5s stand for?
I always thought it meant Second, as in Second Version.
Nothing in particular. It's just a designation Apple started using with the iPhone 3GS when they made major changes to the internals of the iPhone but didn't significantly change the exterior. They probably though that "S" sounded better than "B" or "Version 2".
I think that this "S" stands for Security because of the fingerprint sensor. For example the S from the 3GS was for speed, the S from 4s was for siri and this is kind of a security matter.