Someone could've stood to do a little more research on the name before picking it...not to mention that it's easily the most completely non-indicative name I've ever seen for a piece of software. Shortening "AmigaOS 4" to "OS4" is one thing, within the scope of a community that understands the reference, but just calling your Linux distribution "OS..." It's like selling a particular brew as "BEER," or perhaps "BEER 4." Dumb.
You mean you've never seen this...
