A regular tetrahedron
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Rohmbus is a four sided figure (quadrilateral) that is made up of two equilateral triangles
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
Put the triangles in a line alternately pointing up and down.
there are more than four: equilateral, right, obtuse, acute, scalene
Sort of depends on how the two triangles are beforehand. One nice way to make four equilateral triangles from six matchsticks is to make a tetrahedron (a triangular pyramid).