When I think 8 point star, I immediately think Ishtar, Astarte, Ianna, Venus, etc. This is one of the symbols representing that figure http://sherridhyan.com/symbols%20pictures/Symbol18.gif
But when I look at your symbol, I see a compass. 8 points (north, north east, east, south east, south, south west, west, and north west). North and south are the most prominent points on a compass because they create the axis that our planet spins on, if you keep going north, reach the north pole and continue in the same direction, you'll suddenly be going south. But when you go west, you'll go west forever, and the same with east.
There are many many variations of the magickal compass, one that I work with is the runic compasses. Look at the first two symbols on this page.
This is off the top of my head, but I'll take a look through my notes and resources for you and let you know if I find any other matches.