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While looking at iPad models, I notice several showing as (MM).

In particular, the 4th generation iPad mini with Cellular has models A1454 and A1455 with the latter being labeled (MM). The same exists for A1459/A1460 on the larger iPad with a Retina display.

What does MM represent?

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I think it may be Mobility Management, which is a part of a cellular protocol. I'm not familiar with it, but here's the Wikipedia page. I'm an engineer dealing with cellular, so I'm actually gonna read this myself.

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Great tip - +1 (I figure someone here will eventually nail down the acronym or we'll have entertaining guesses. Wither way, win!) That link makes MM look like part of a GSM spec, which could make sense to call it that over the CDMA version of iOS devices. – bmike♦ Feb 23 at 22:43

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