Acronym	stap
TOCID symbol	(5/2)Q
Name	bistrophic pentagrammic antiprism, stellar antiprism, 5/2-antiprism
	© ©
Circumradius	sqrt[(15+sqrt(5))/40] = 0.656431
Vertex figure	[33,5/2]
Face vector	10, 20, 12
Confer	more general: {n/2}-ap   {n/d}-ap   variations: fo5/2of&#q   compounds: sassid   sadsid   general polytopal classes: segmentohedra
External links

Incidence matrix according to Dynkin symbol

s2s5/2s

demi( . .   . ) | 10 | 1 1  2 | 1  3
----------------+----+--------+-----
      s2s   .   |  2 | 5 *  * | 0  2
      s 2   s   |  2 | * 5  * | 0  2
sefa( . s5/2s ) |  2 | * * 10 | 1  1
----------------+----+--------+-----
      . s5/2s   ♦  5 | 0 0  5 | 2  *
sefa( s2s5/2s ) |  3 | 1 1  1 | * 10

starting figure: x x5/2x

β2β5o

both( . . .   ) | 10 | 1 1  2 | 1  3
----------------+----+--------+-----
      s2s . (r) |  2 | 5 *  * | 0  2
      s2s . (l) |  2 | * 5  * | 0  2
sefa( . β5o   ) |  2 | * * 10 | 1  1
----------------+----+--------+-----
      . β5o   ) ♦  5 | 0 0  5 | 2  *
sefa( β2β5o   ) |  3 | 1 1  1 | * 10

or
both( . . . ) | 10 |  2  2 | 1  3
--------------+----+-------+-----
both( s2s . ) |  2 | 10  * | 0  2
sefa( . β5o ) |  2 |  * 10 | 1  1
--------------+----+-------+-----
      . β5o   ♦  5 |  0  5 | 2  *
sefa( β2β5o ) |  3 |  2  1 | * 10

starting figure: x x5o

xo5/2ox&#x   → height = sqrt[(sqrt(5)-1)/2] = 0.786151
({5/2} || {5/2} with crossed lacings)

o.5/2o.    | 5 * | 2  2 0 | 1 2 1 0
.o5/2.o    | * 5 | 0  2 2 | 0 1 2 1
-----------+-----+--------+--------
x.   ..    | 2 0 | 5  * * | 1 1 0 0
oo5/2oo&#x | 1 1 | * 10 * | 0 1 1 0
..   .x    | 0 2 | *  * 5 | 0 0 1 1
-----------+-----+--------+--------
x.5/2o.    | 5 0 | 5  0 0 | 1 * * *
xo   ..&#x | 2 1 | 1  2 0 | * 5 * *
..   ox&#x | 1 2 | 0  2 1 | * * 5 *
.o5/2.x    | 0 5 | 0  0 5 | * * * 1