The Octahedron corresponds classically to Air. The 8 faces corresponds to Hod and mental activity?? The 12 edges naturally correspond to the zodiac. Octahedron is an important balancer, healer. It opens Heart, Throat & Brow for clarity, overview, seeing additional truths/realities. It clears Objectivity i.e. clears the way for new things, upliftment, aura cleanse. Eyesight, sinuses, repels colds.