A pyramid would seem to fit the given description.
A pyramid. But the point where the triangular faces meet is a vertex, not a vortex. A vortex is a spinning mass of fluid like a whirlpool!
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The noun vortex is a singular, common noun, a word for whirling fluid or air, a thing.
Dhanvada M. Rao has written: 'Subsonic investigations of vortex interaction control for enhanced high-alpha aerodynamics of a chine forebody/delta wing configuration' -- subject(s): Aerodynamics, Airplanes, Triangular Wings, Wings, Triangular
Yes, it is very common for a vortex to form in a bathtub as it drains.
No. Vortex is a noun.
There is no antonym for vortex.
Vortex.
In the eye of the vortex
Every tornado is a vortex.
Look at that Vortex go spinning!
Vortex Comics was created in 1982.