Carl Gustav Jung's interpretation, from a psychological perspective, roughly states that the orientation of the Swastika denotes the direction of action of the will, either from the inside outward (The desire or inclination of the person(s) to act on the world), or, oriented the other way, the movement of the person's will, or self inwardly, in a more introspective manner. that is: spiritually.

To change the world (through force), or change one's self personally.

Also called Thor's Hammer I believe in Norse mythology, but essentially the same derivation of meaning.