Great heptagrammic pyramid

Great heptagrammic pyramid
Rank	3
Type	Segmentotope
Notation
Bowers style acronym	Gishpy
Coxeter diagram	ox7/3oo&#x
Elements
Faces	7 triangles, 1 great heptagram
Edges	7+7
Vertices	1+7
Vertex figures	1 great heptagram, edge length 1
	7 isosceles triangles, edge lengths 1, 1, 2cos(3π/7)
Measures (edge length 1)
Circumradius	${\frac {1}{\sqrt {4-{\frac {1}{\sin ^{2}{\frac {3\pi }{7}}}}}}}\approx 0.58243$
Volume	${\frac {7{\sqrt {4-{\frac {1}{\sin ^{2}{\frac {3\pi }{7}}}}}}}{24\tan {\frac {3\pi }{7}}}}\approx 0.11430$
Height	${\frac {\sqrt {4-{\frac {1}{\sin ^{2}{\frac {3\pi }{7}}}}}}{2}}\approx 0.85847$
Related polytopes
Army	Non-RF heppy
Regiment	Gishpy
Dual	Great heptagrammic pyramid
Conjugates	Heptagonal pyramid, heptagrammic pyramid
Abstract & topological properties
Orientable	Yes
Properties
Symmetry	I2(7)×I, order 14
Convex	No
Nature	Tame

The great heptagrammic pyramid or gishpy is a pyramid with a great heptagrammic base and 7 triangles as sides. A version with equilateral triangles exists and is orbiform.