Seeing an unknown person whom one cannot liken to anyone signifies the dreamer's own self, which Allah Most High has shown to him. It may also signify that the dreamer has reached the final limit of his provision and lifespan.
Seeing two people together signifies safety from fear and hardship.
Seeing three people signifies that the dreamer will protect himself from forbidden things.
Seeing a known person signifies receiving something from that person or from someone similar to him; taking from that person something one likes or dislikes signifies obtaining something one hopes for from him.