If the number zero appears to the right of another number, it doubles it by 10, indicating plenty of unlimited potential and possibilities. A zero, on the other hand, has no worth or substance on its own and may represent desolation and loneliness.
According to the more mystical view, zero represents the unconscious, the feminine, and the grandmother archetype. The Fool, the unnumbered card in the Tarot, is also a symbol of the unconscious mind. The circle or mandala is its related shape.