To see a triangle in your dream symbolises your aspirations, potential and truth. It represents your spirituality: the body, mind, and spirit. If the triangle is pointing upward, then it signifies the masculine while a downward pointing triangle signifies the feminine. Alternatively, seeing a triangle serves as some sort of warning or caution, especially if the triangle is yellow. The dream may also be a metaphor for a love triangle in your waking life.
- Common Dreams