Posted by **mathstudent** on Friday, January 16, 2009 at 2:22pm.

I'm reading a formula (lots of greek letters) and I see a symbol that looks like a backward six. That doesn't seem to be any greek letter... What is it?

- math -
**drwls**, Friday, January 16, 2009 at 2:32pm
You seem to be describing the nameless "partial derivative" symbol, sometimes called "del", a modified lower case Greek delta.

See

http://en.wikipedia.org/wiki/Partial_derivative

- math -
**mathstudent**, Friday, January 16, 2009 at 6:11pm
Ah ha! That's exactly what that is. And I knew that a long time ago. Thanks!

It doesn't show up on Wikipedia's greek alphabet page at all, but that's more than good enough! Thanks!

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