Question

http://en.wikipedia.org/wiki/Delta_%28letter%29 is δ what is ∂ that we use in partial differentiation? is it also delta? or just partial derivative symbol?

Answer 1

It's just the partial derivative symbol, I've heard it called "dow".

Answer 2

They all mean difference. I've heard the partial derivative symbol called, "del"

Answer 3

The rounded d is partial diff.
A straight up d is the usual derivative.
Squiggly d is "a small change"