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... apart from crystal structures. Everything else seems to tend towards spherical symmetry. This is also excluding arbitrary coordinate systems.

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    The $p_x$, $p_y$ and $p_z$ atomic orbitals are at 90 degrees to each other. – John Rennie Jan 25 '15 at 17:18
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    The magnetic field is set up perpendicular to an electric field from a moving charge. Magnetic force acts perpendicularly to the direction of motion of a charge. Acceleration and net force in a circular orbit is towards the circular center perpendicular to the orbit. – Steeven Jan 25 '15 at 17:24
  • When there is an oblique elastic collision between two bodies of the same mass (one being at rest), they move perpendicular to each other after it occurs. – Hritik Narayan Jan 25 '15 at 18:06
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    Centripetal force acts at a right angle to the axis of rotation, at a right angle to the direction of motion. This question seems a bit whimsical. – RedGrittyBrick Jan 26 '15 at 11:54

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