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Z for mainframe, I for iSeries (think AS/400 - but now these machines are huge), and P for AIX.

the installed number of those three is immense and in many organizations most people would never suspect.

Like huge swaths of the insurance, banking and healthcare industries. (Current iSeries shop here - we are a ticket printing company) Construction is also a huge shop. In fact, iSeries is SAP's preferred platform, but the SAP Windows install consultants won't tell you that because they make way more money consulting on Windows.

Like what organizations for example?

Look at, for example, Jack Henry & Associates http://en.wikipedia.org/wiki/Jack_Henry_%26_Associates

Their core banking stuff, which powers the $600 million capitalization local bank I use, is System i (AS/400) based as I understand it.

Right, that's not actually surprising to me, I know banks still use mainframes, and I thought it was well-known. Same about airlines, and heavy-duty control systems (say, sewage control for a large city or something) that are likely to be legacy. I was wondering what could be organizations I wouldn't even suspect.

I believe O'Reilly auto parts has an AS/400 at each of it's stores.

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