Acronym	squap
TOCID symbol	(4)Q
Name	square antiprism
Circumradius	sqrt((4+sqrt(2))/8) = 0.822664
Vertex figure	[33,4]
Snub derivation
General of army	(is itself convex)
Colonel of regiment	(is itself locally convex)
Confer	n-ap   n/2-ap   n/d-ap   gassic   gidsac
External links

Incidence matrix according to Dynkin symbol

s2s4s

demi( . . . ) | 8 | 1 1 2 | 1 3
--------------+---+-------+----
      s2s .   ♦ 2 | 4 * * | 0 2
      s 2 s   ♦ 2 | * 4 * | 0 2
sefa( . s4s ) | 2 | * * 8 | 1 1
--------------+---+-------+----
      . s4s   ♦ 4 | 0 0 4 | 2 *
sefa( s2s4s ) | 3 | 1 1 1 | * 8

s2s8o

demi( . . . ) | 8 | 2 2 | 1 3
--------------+---+-----+----
      s2s .   ♦ 2 | 8 * | 0 2
sefa( . s8o ) | 2 | * 8 | 1 1
--------------+---+-----+----
      . s8o   ♦ 4 | 0 4 | 2 *
sefa( s2s8o ) | 3 | 2 1 | * 8

xo4ox&#x   → height = 1/sqrt(sqrt(2)) = 0.840896
({4} || dual {4})

o.4o.    | 4 * | 2 2 0 | 1 2 1 0
.o4.o    | * 4 | 0 2 2 | 0 1 2 1
---------+-----+-------+--------
x. ..    | 2 0 | 4 * * | 1 1 0 0
oo4oo&#x | 1 1 | * 8 * | 0 1 1 0
.. .x    | 0 2 | * * 4 | 0 0 1 1
---------+-----+-------+--------
x.4o.    | 4 0 | 4 0 0 | 1 * * *
xo ..&#x | 2 1 | 1 2 0 | * 4 * *
.. ox&#x | 1 2 | 0 2 1 | * * 4 *
.o4.x    | 0 4 | 0 0 4 | * * * 1