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There's mathoverflow.stackexchange and math.stackexchange. There seem to be a number of sites that are have both an "overflow" site and a "exchange" name as well. Eh?

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    Possible duplicate of Where do the names of the Stack Overflow trilogy sites come from? – JAL Nov 28 '16 at 2:20
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    @JAL Doesn't seem to explain anything about mathoverflow and math.stackexchange, which are not from the original trilogy. – user315433 Nov 28 '16 at 2:27
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    @zaq hmm, can't find one related specifically to the math sites, maybe this can provide more info? Where did the name “Stack Exchange” come from? – JAL Nov 28 '16 at 2:29
  • Outside of MO and Math SE, what other overflow-exchange combinations are you thinking of? – Undo Nov 28 '16 at 2:55
  • I'm trying to remember where else I saw this. I think I might be just getting confused at using the name "stackoverflow.com" instead of something like programming.stackoverflow.com. – Marxos Nov 28 '16 at 2:56
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    Actually Stack Overflow and Software Engineering are two completely different sites. – Nissa Nov 28 '16 at 3:01
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There are two Stack Exchange sites with the suffix "Overflow": Stack Overflow and MathOverflow (as well as Stack Overflow sites in other languages).

The name "Stack Overflow" was chosen by community voting in 2008, beating out suggestions like privatevoid.com and algorithmical.com (full poll results here). I couldn't tell you why those 1,721 people voted for it, but the name stuck, and over eight years later, it's still around.

MathOverflow has a different history. It was originally an independent site, launched in late 2009 but inspired by Stack Overflow (hence the name "MathOverflow"). It then joined Stack Exchange in 2013.

The names for the rest of the Stack Exchange network - and the name "Stack Exchange" - have been covered in Where do the names of the Stack Overflow trilogy sites come from? (for the Trilogy) and Where did the name "Stack Exchange" come from?. "Stack Exchange" was short for "The Stack Overflow Knowledge Exchange" (no "Platform"), in the beginning. That's quite the mouthful.

There are other non-Trilogy sites without names of the form "[X] Stack Exchange". Many of them are discussed in Why do some Stack Exchange sites have their own domain names?. Quite a few came from Stack Exchange 1.0 sites and outside sites - which have their own long, complicated histories.

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