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Maybe Augee will remember the real reason. What is RHNO? Ruggedized Helmet (mount) for Night Optics?
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I do not know what "RHNO" stands for, though the superficial resemblance from which the "Rhino" nickname stems is, of course, obvious.
All I know is that Norotos refers to it as the "RHNO II," without the "I," previously I had just always referred to the articulating arm, and still refer to the legacy arms as "Rhinos," though a fair assumption could be that the legacy mount is necessarily the "RHNO (I)."
At the same time, it could be the tail wagging the dog, and by the time the RHNO II was introduced, the "Rhino" nickname was so entrenched that they just "made up" a matching acronym for it where one had not previously existed. I don't know enough off top of my head of the specific military and commercial nomenclature to say right now, it would take a little research/digging, though a good start would be to look up the official nomenclature of the COEI in the supply system.
~Augee