Digital photography

a question about ISO.
How do you say it?
I read an article the other day and the dude that wrote it put "ISO (pronounced Eye Es Oh)"
I always said 'EyeSo', well thought/ read it as, I rarely talk photography.
Wondered if I am the only one.

When on the receiving end of an education I heard it as three separate letters. Some years later, I continued to say it this way, resulting in my own students doing the same - hundreds of them by the end - but this doesn't necessarily make it right.

When individual standards are referred to, ISO9000 (Quality Management) for example, I've only ever heard it said out loud as three letters (Eye Es Oh nine thousand). I could believe ISO as the preferred short form refers to written versions in preference to I.S.O. but then I'm from Oop North so what would I know about language conventions?

Part of the 'problem' may be a lack of consistency - I've only ever heard ASA as three letters, but heard DIN as both initials and an acronym. I can't imagine anyone into photography will fail to understand 'Eye Es Oh' or 'EyeSo' followed by a number - or be right if they tell you you're wrong whichever you use.

Someone post some pictures please or I'm going to start digging out my crap...