1. A cross made of four capital gammas; a swastika; a fylfot (a decorative or religious symbol in the form of a swastika).
2. A Greek cross formed of four capital gammas all facing outward so that the ends of the arms of the cross are open.
3. A pattern consisting of four capital Greek gammas (tetra-gammadion); especially, when joined at the center to form a swastika or a very old symbol used by many ancient cultures.

An Example of a Gammadion or a Gammation Symbol