You are a triangular based pyramid (tetahedron) with 4 faces, 6 edges and 4 vertices.
...CUBE hAS 6 CONGRuent faceS ,8 vertices and 12 EDGES
They can have faces which are triangles, quadrilaterals, pentagons, hexagons or heptagons. It has 8 faces and can have 6 to 12 vertices.
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.
Icosahedron are a shape with 20 faces, 30 edges and 12 vertices. All the faces are triangles.
An equilateral triangular pyramid
triangle based pyramid