Same with StackOverflow. Or Stack Overflow. Or SO. I don't know if it's proper to run the words together or not when written. It often appears like that around the site, but in some meta questions I see the words separated by a space.
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4This looks more appropriate on Meta to me, since it's about the site itself... Voting to migrate. – Alenanno Jun 25 '11 at 18:22
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I reasoned that the principle behind the question belonged to EL&U (@rintaun! :) and hence put it there. But I concede the point. You're right. – Daniel Jun 25 '11 at 19:02
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Just don't mix 'em up with SEO. Ewww. – MT_Head Jun 25 '11 at 19:44
The "official" names are Stack Exchange and Stack Overflow. If you go to the "About" page on each site, these are the only names that are used. In general usage, though, like you've pointed out yourself, the space appears to be optional. If you prefer to abbreviate, SE and SO are perfectly valid as well, similar to how English Language & Usage is often abbreviated as EL&U.
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@drm65 Haha. Either way, neat. I've not posted on meta before. First time for everything, I guess, even if it's a bit roundabout. :P – rintaun Jun 25 '11 at 19:01
See
http://stackexchange.com/legal/trademark-guidance
under the heading
Proper Use of the Stack Exchange Name
