Definitions for "Tetrahedron"
A solid figure inclosed or bounded by four triangles.
A basic structural system with 4 triangular faces and 3 triangles around each of its 4 vertices.
A polyhedron with four faces
a large kite-shaped indicator sometimes located beside the runway and may move freely or be set manually
An underwater obstacle taking its name from its geometrical shape; used by the German's to scuttle landing craft.
a three-dimensional simplex
a three-dimensional simplicial complex
Minimum Structure of Universe: 4 Windows, 6 Edges, 4 Corners