Picture Style Icons: What Do They Mean? 400D

I was wondering what the Picture Style Icons meant, but I found them described by pressing the Jump button from the Picture Styles Menu.

Sharpness: Circle, almost half filled with a couple of vertical lines.

Contrast: Circle, half filled like a half moon.

Saturation: Three Little Circles arranged in an equilateral triangle formation

Color Tone: Circle trisected by three lines, like a "peace sign."