the.com/tetrahedron
the simplest possible solid, four triangles refusing to be anything less than perfect
means A solid shape with four triangular faces, four vertices, and six edges — the simplest of the polyhedra.
from From Greek 'tetra-' (four) plus 'hedra' (seat or base), so literally 'four-seated' — a body that sits on four faces. The same '-hedron' anchors its larger cousins, the hexahedron and octahedron, all members of Euclid's family of solids.
minimum solidFewest faces any 3D shape can have
self-dualIts dual is another tetrahedron
flame shapePlato linked it to fire
strongest jointRigid frame engineers love for stability
every vertexTouches all three other vertices directly