Acronym  addasi 
Name 
altered disnub icosahedron, compound of 20 oct (but not dasi) 
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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  
External links 
This compound has rotational freedom. It can be obtained at φ = 0° by 2 coincident si, rotating either of the (then) coincident oct, thought of as triagular antiprisms within an ike, in opposite directions around those axes. At φ = 60° this compound again comes to be 2 coincident gissi. Inbetween there are 2 further singular positions: One, where 4 (different oriented oct coincide each, resulting in a 4fold cover of se. The other one, when vertices coincide by pairs, resulting in a static compound of 20 oct, called dasi. (J. Bowers further uses iddasi (inner ...) for smaller values of φ, resp. oddasi (outer ...) for larger values. The reverted range at φ > 60° then gets called giddassi (great ...).)
120  2 2  3 1  1 ++++ 2  120 *  1 1  1 2  * 120  2 0  1 ++++ 3  1 2  120 *  1 3  3 0  * 40  1 ++++ ♦ 6  6 6  6 2  20
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