Abbreviation of “number”
Ok, so the abbreviation is No, but should it have a capital ‘n’ to distinguish if from ‘no’, and is it with a period after it, or not?
It is short for numero so, at least in British English, I understand that there should be no period (as the last letter of the abbreviation is the last letter of the word), but in US English there would be (because they don’t care about that sort of thing).
And the plural...? Nos. or Nos ... or nos or nos. ? or just leave it as No?