Notation is a pretty big deal in Mathematics. As software people we should be able to appreciate how evocative notation can get rid of unnecessary cognitive load when dealing with complexity.

Here is a link that talks about notation in Maths: http://www.cut-the-knot.org/language/index.shtml . Here's another link: http://en.wikipedia.org/wiki/Nabla_symbol . The example from calculus is also pretty famous.

Also, FWIW, I didn't downvote you.