It is a triangular prism.
A right triangular prism has two identical faces. Two faces may or may not be identical in an oblique prism, in which the lateral edges are not perpendicular to the bases.
a right prism
A tetrahedron has 4 faces but it doesn't look like a rectangle standing up. It is formed by 4 triangular faces.
The solid shape that has one square face and four triangular faces is called a pyramid. If you were to have a shape that had four triangular faces and no square face, it would be called a triangular pyramid.
It is a triangular prism
The regular solid, with 20 identical equilateral triangular faces, is called an icosahedron.
A cube, like a prism has two identical parallel faces which are joined by rectangular faces (a square being a special case of a rectangle). A pyramid, on the other hand, has a number of triangular faces meeting at an apex: a cube has no triangular faces.
A triangular prism.
A right triangular prism has two identical faces. Two faces may or may not be identical in an oblique prism, in which the lateral edges are not perpendicular to the bases.
4
Triangular Prism
It has 20 identical equilateral triangular faces.
It is a triangular prism that would fit the given description
a right prism
triangular-based prism
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A tetrahedron has 4 faces but it doesn't look like a rectangle standing up. It is formed by 4 triangular faces.