From FreeCAD Documentation
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This description is based on the MED format as described here .
Segment element
File:Segments.gif
Triangle element
File:Triangles.gif
Quadratic element
File:Quadrangles.gif
Tetrahedron element
File:Tetraedres.gif
Tetrahedron with four or ten nodes
Edge
Node 1
Node 2
Middle node
A1
N1
N2
N5
A2
N2
N3
N6
A3
N3
N1
N7
A4
N1
N4
N8
A5
N2
N4
N9
A6
N3
N4
N10
Tetrahedron Faces
Face
Edge 1
Edge 2
Edge 3
F1
A1
A2
A3
F2
A4
-A5
-A1
F3
A5
-A6
-A2
F4
A6
-A4
-A3
Pyramid element
File:Pyramides.gif
Hexahedron element
File:Hexaedres.gif
Hexahedron with eight or twenty nodes
Edge
Node 1
Node 2
Middle node
A1
N1
N2
N9
A2
N2
N3
N10
A3
N3
N4
N11
A4
N4
N1
N12
A5
N5
N6
N13
A6
N6
N7
N14
A7
N7
N7
N15
A8
N8
N5
N16
A9
N1
N5
N17
A10
N2
N6
N18
A11
N3
N7
N19
A12
N4
N8
N20
Hexahedron faces
Face
Edge 1
Edge 2
Edge 3
Edge 4
F1
A1
A2
A3
A4
F2
-A8
-A7
-A6
-A5
F3
A9
A5
-A10
-A1
F4
A10
A6
-A11
-A2
F5
A11
A7
-A12
-A3
F6
A12
A8
-A9
-A4
Pentahedron element
File:Pentaedres.gif