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I have seen the following questions: Pluralization of acronyms ending in 'S', What is the correct way to pluralize an acronym? or Plurals of acronyms, letters, numbers — use an apostrophe or not?

In all of them, the plural of in the extended form goes in the end:

One compact disk, two compact disks

One automated teller machines, two automated teller machines

My question is, what about acronyms (or initialisms...) such as

One rotation per hour: 1 RPH

Two rotations per hour: 2 ???

(Note that RPH is a home-made acronym.) Obviously RsPH is not an appropriate choice, but RPHs seems a bit strange (I would be fine for rotation per hours, but maybe not for rotations per hour).

Any piece of advice?

Edwin Ashworth
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anderstood
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    @EdwinAshworth In the scientific literature, it is customary to introduce one's own acronyms, to avoid repeating the same list of words over and over again. – anderstood Sep 26 '17 at 21:33
  • Acronyms, like words, are accepted forms, not DIY contrivances. John M. Landsberg addresses abbreviations such as 1 mph; 7 mph in the 'Do you put an 's' at the end of acronym?' thread. – Edwin Ashworth Sep 26 '17 at 21:36
  • ELU is concerned with discussing established standard usage. If DIY abbreviations/acronyms are de rigeur in some non-mainstream registers, sites and style guides addressing such are the best places to discuss / research protocols. – Edwin Ashworth Sep 26 '17 at 21:40
  • Even the Oxford English Dictionary lists their own abbrevations: http://public.oed.com/how-to-use-the-oed/abbreviations/. Abbrevations such as "Absol." (for absolute) and "absol." (for absolutely) seem closer to DIY contrivance than accepted form (accepted by who?). 2) The ELU page https://english.stackexchange.com/help/on-topic is not as clear as clear-cut as your comment.
    • – anderstood Sep 26 '17 at 21:55