Pyramid
A pyramid was a three-sided geometric shape whose outer surface is comprised of three triangles, converged at a single peak, with a triangular base. A pyramid could also be four-sided with four convergent triangles and a square base (known as a "square triangle")

According to Odo, a pyramid was "one of the most mysterious shapes in nature," while demonstrating a pyramid-shaped  container to a sick infant Changeling. Later, Odo transferred the Changeling back and forth from the pyramid-shaped to cube-shaped glass containers, and at one point said, "Now Mister Pyramid, here comes Mister Cube." ()

Pyramidical designs  
Various planets, including Earth, Ventax II, and the Loque'eque homeworld constructed pyramid-shaped architectural structures, known as s. (; ; )

Borg distribution nodes were shaped like a square pyramid. ()

The dice used by the Wadi for their game chula were pyramidic. ()

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Mathematics