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I came across an ISO, say ISO 12345:78, and wondered what is the way to pronunce it:

  • For the ISO part, should I say...

    • "ei" "es" "ou"?
    • or "aiso"?
  • For the 12345:78 part, should I say...

    • "one" "two" "three" "four" "five" "colon" "seven" "eight"?
    • or "twelve" "thirty-four" "five" "colon" "seventy-eigth"?
    • or "twelve thousands, three hundred fourty-five" "colon" "seventy-eigth"?

Also, for the : part, should I proununce "colon" or just say nothing?

I found a couple of interesting debates in wordreference, but it still a bit uncertain to me if there is a standard way of doing it:

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    I'm not a professional engineer, so I'm hestitant to give this as a proper answer. I've heard both "eye-ess-oh" and "aiso" for ISO. The numbers are usually read as as whole numbers rather than a series of digits, and I've never heard anyone say "colon." "Aiso twelve thousand three hundred forty five <pause> seventy eight." – Jason Patterson Nov 4 '14 at 12:54
  • Thanks a lot, @JasonPatterson Feel free to post the comment as the beginning of an answer. You (I assume English native speaker) using it is a good reference for me. – fedorqui Nov 4 '14 at 16:03
  • I have only heard aiso pronunciation in AmE. The numbers can be read different ways, but the colon should be replaced by "part, section, article, etc." depending on how those sections are indicated in the document. – user3169 Nov 4 '14 at 17:42
  • @user3169 thanks, that makes sense. Feel free to post an answer, this was useful! – fedorqui Nov 7 '14 at 11:41
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I have only heard aiso pronunciation in AmE.

The numbers can be read different ways, but instead of saying "colon" you should say "part, section, article, etc.", depending on how those sections are indicated in the document

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    I think that most people would pronounce ISO like "aye ess oh," but saying "aiso" wouldn't be unheard of. I am partial to "aiso" myself since it is how I refer to .iso formatted archive images. (I am also American.) – Crazy Eyes Nov 7 '14 at 22:32
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    @CrazyEyes I guess there is no standard on how to say ISO... – user3169 Nov 8 '14 at 19:38

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