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While a triangular prism can have equilateral triangle faces, it has more faces that are quadrilateral (or rectangular).
A polyhedron with only equilateral triangular faces could be a tetrahedron, an octahedron in the form of a square based dipyramid, or an icosahedron.
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The answer is a polyhedron
Tetrahedron
A regular polyhedron has equal size faces as in the case of a tetrahedron which is a triangular base pyramid that has 4 equilateral triangle faces.
An icosahedron is a regular polyhedron with 20 equilateral triangle faces.
octahedron