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One part copper, two parts vanadium and four parts sulfur, the alloy features a 3D pyrochlore lattice consisting of corner-sharing tetrahedra.

For example, a tetrahedron, a solid three-dimensional pyramid with four triangular faces, would fill in a group of four neurons firing together.

Off the shores of Long Beach, where sails could catch wind, a white fleet clustered around orange buoys shaped like tetrahedrons.

It’s actually a tetrahedron from which all kinds of creative characters pop forth.

Bell and his team, called the Aerial Experiment Association, ultimately focused their kite designs on tetrahedrons, or pyramids made of four triangles, and biplane structures, several of which used red silk.