All Stargates have a group of glyphs spaced around the inner ring (39 for Milky Way gates, 36 for Pegasus gates) and nine chevrons spaced equally around the
outer edge. The glyphs on Milky Way and Pegasus gates represent constellations. These two features are used as a coordinate system for the gate to target and form a connection with another gate. Gate addresses are described in terms of how many chevrons are needed to dial them, seven at the least and nine at the most.
For a standard seven-chevron address, the first six glyphs represent points in space, forming three-dimensional coordinates. The seventh represents the point of origin, a glyph which is unique to each gate. For Stargates to access a destination outside of their galaxy, eight chevrons are used the first six target a destination as normal, while a seventh glyph prior to the point of origin adds a distance calculation to the address, targeting a gate outside the galaxy as opposed to a local one.