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Regular heptagram  

Regular {7/2} heptagram  
Edges and vertices  7 
Schläfli symbol  {7/2}, {7/3} 
Coxeter diagram  , 
Symmetry group  Dihedral (D_{7}) 
Properties  star, cyclic, equilateral, isogonal, isotoxal 
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Regular heptagram  

Regular {7/2} heptagram  
Edges and vertices  7 
Schläfli symbol  {7/2}, {7/3} 
Coxeter diagram  , 
Symmetry group  Dihedral (D_{7}) 
Properties  star, cyclic, equilateral, isogonal, isotoxal 
A heptagram, septagram, or septegram is a sevenpointed star drawn with seven straight strokes.
In general, a heptagram is any selfintersecting heptagon (7sided polygon).
There are two regular heptagrams, labeled as {7/2} and {7/3}, with the second number representing the vertex interval step from a regular heptagram, {7/1}.
This is the smallest star polygon that can be drawn in two forms, as irreducible fractions. The two heptagrams are sometimes called the heptagram (for {7/2}) and the great heptagram (for {7/3}).
The previous one, the regular hexagram {6/2}, is a compound of two triangles. The smallest star polygon is the {5/2} pentagram.
The next one is the {8/3} octagram, followed by the regular enneagram, which also has two forms: {9/2} and {9/4}, as well as one compound of 3 triangles {9/3}.
First heptagram {7/2}  Second heptagram {7/3}  Both heptagrams inscribed within a heptagon 
Heptagrammic prism (7/2)  Heptagrammic prism (7/3) 
This section needs additional citations for verification. (July 2010) 
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