That's an interesting one. It's got that Streamline Moderne aesthetic to it. That's how such a style is called in architecture at least. I don't know if that term extends to graphic design as well.
Also, you're clearly not the only one who has wondered this; I started searching for the font name, but all I could find at first is people asking the same question.
Perhaps this could help: WhatTheFont! « MyFonts