I have a question. How do I make an initialism out of a word/phrase with a number?

For an example: Should Rainbow 6 Siege be R6S because of initialism is an abbreviation made of initial letters but 6 is not a letter.

  • This gets me wondering about R2-D2 and C-3PO.
    – user150753
    Dec 29, 2018 at 11:28
  • 1
    @Jeeped I think they are just series number of the droid and not an abbreviation of anything. Like R2-D2 stands for R2 series astromech droid.
    – phwt
    Dec 29, 2018 at 11:35
  • If initialism means what I think it does, then you can't. The best you can do is an abbreviation like W3C (World Wide Web Consortium), K9, G20, MI5. Your R6S would be an abbreviation, I don't think it would meet the requirements for either acronym or initialism. Abbreviation though, yes. Interestingly most of these abbreviations are listed under the Wikipedia acronym article, though I don't think it contends they are acronyms. Is it an unimportant point whether your abbreviation is an initialism or acronym or any other 'thing'?
    – Zebrafish
    Dec 29, 2018 at 13:01
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    What about RSS, where the first S stands for six, the word that represents the numeral? Dec 29, 2018 at 17:55
  • @Zebrafish Thanks! So all I do is just to abbreviate to make it understandable because it can't be an initialism.
    – phwt
    Dec 30, 2018 at 14:37

1 Answer 1


It's perfectly acceptable to use a 'numeronym'

A numeronym is a word where a number is used to form an abbreviation, such as K9 for canine, or W3 for World Wide Web etc.


Your reference of Rainbow 6 Siege as R6S is a perfectly acceptable numeronym.

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