This symbol is more recognisable as the logo for the 'skinhead' movement Blood and Honour, who themselves use the logo taken from the Afrikaner movement, the AWB - Afrikaner Weerstandsbewegin.
The symbol is certainly pagan in origin and was widely used throughout National Socialist Germany - and was even carved onto Himmler's chair. This National Socialist book titled 'Your Destiny' carries the triskelion on its cover.
The emblem seems to have its origins - or at least is connected to - the pagan symbol we call the Valknot. The Valknot varies in style but the basic concept is that is consists of three interlocking triangles. The triskelion symbol lies at the heart of the valknot.