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A tetrahedron.
A pyramid
Isosceles TetrahedronA solid with four faces is a tetrahedron. Each of the faces is a triangle. If all the triangles are congruent, you have an isosceles tetrahedron.
Its name is called a square based pyramid.
Octohedron, or diamond
square base pyramid and a triangular base pyramid
geometric solid
Traditional geometric figures have dimensions which are integers: 0 for a point, 1 for a line or Mobius strip, 2 for a plane figure or Klein bottle, and 3 for a solid. Fractals have dimensions which are not integers.
They exist in the realm of typographic errors. Triangular prisms and rectangular prisms are solid geometric figures.
It is a 3 dimensional shape and in geometrical terms it's only limited to one of 5 perfect solids
A pyramid. The square being the base and the triangles the 'sides' - each having a side connected to a side of the square - the other sides connected to 'neighbor-triangles'.