The text means:
"Skadi, n: Germanic goddess of independence, winter, the hunt, and war. Wife of Njörd, mother of Freja."
As for the symbol; it's six valknuts (an ancient Germanic symbol) ordered into a six-pointed star. There have been numerous questions and speculations as to why this shape was chosen, but as far as I know, Njörd never bothered to actually answer this. It remains Skadi's enigma.