Comment #5 on issue 2637 by asmeurer: Unicode Sigma for pretty printed Sum http://code.google.com/p/sympy/issues/detail?id=2637
That's probably just a coincidence, though, since that angle character isn't actually coming from the same font as the rest of the characters on my machine. If I use GNU unifont, which has *all* unicode characters (literally), it looks like crap. So I still think we should just do an even number of lines.
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