A dream or vision about the number three signifies spiritual broaden your wealth, show full of ideas and possibilities. The number three is one of the most magical numbers out there. Everything you give someone, you receive back three times or you experience the power of the three as a symbolic element.
Another explanation is, being the world traveler, spiritual and psychic. You can also assume with the three that the dream or vision has a masculine charge; your masculine energy is clearly present.