A triangular prism because it is a solid figure with two parallel bases that are triangles and three faces that are rectangles

A triangular prism matches that description.

A triangular prism have 2 triangular faces and 3 rectangular faces.

A Triangular Prism

A triangular prism.

A triangular based pyramid is the shape that best meets the criteria you are looking for.

A triangular prism.

Triangular Prism

Triangular Prism

Triangular Prism

A triangular prism has those kind of faces

Rectangular prism

Triangular prism

The faces might be arranged so as to make a triangular prism.