Acronym  si 
Name 
snub icosahedron, compound of 10 oct (but not gissi) 
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Circumradius  1/sqrt(2) = 0.707107 
Inradius  1/sqrt(6) = 0.408248 
Vertex figure  [3^{4}] 
Dihedral angles
(at margins) 

Confer  gissi addasi 
External links 
It can be obtained by placing 10 oct, thought of as triagular antiprisms, within an ike (in each of the axial orientations) with basefaces oriented in the same way as for the ike.
A double cover of si occurs as special case of addasi.
60  2 2  3 1  1 ++++ 2  60 *  1 1  1 2  * 60  2 0  1 ++++ 3  1 2  60 *  1 3  3 0  * 20  1 ++++ ♦ 6  6 6  6 2  10
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