an edge or in more simpler term "side"
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If the faces are flat, it's a line.
Icosahedron
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.
a cylinder a cylinder
You take a look at what 2-D shape the face is, and then that's the name of the face.