Acronym	12,n-dip
Name	dodecagon - n-gon duoprism
Circumradius	sqrt[2+sqrt(3)+1/(4 sin2(π/n))]
General of army	(is itself convex)
Colonel of regiment	(is itself locally convex)
Face vector	12n, 24n, 13n+12, n+12
Especially	titwadip (n=3)   sitwadip (n=4)   hitwadip (n=6)   otwadip (n=8)   twaddip (n=12)
Confer	general duoprisms: n,m-dip   2n,m-dip
External links

Incidence matrix according to Dynkin symbol

x12o xno   (n>2)

.  . . . | 12n |   2   2 | 1   4  1 | 2  2
---------+-----+---------+----------+-----
x  . . . |   2 | 12n   * | 1   2  0 | 2  1
.  . x . |   2 |   * 12n | 0   2  1 | 1  2
---------+-----+---------+----------+-----
x12o . . |  12 |  12   0 | n   *  * | 2  0
x  . x . |   4 |   2   2 | * 12n  * | 1  1
.  . xno |   n |   0   n | *   * 12 | 0  2
---------+-----+---------+----------+-----
x12o x . ♦  24 |  24  12 | 2  12  0 | n  *
x  . xno ♦  2n |   n  2m | 0   n  2 | * 12

x6x xno   (n>2)

. . . . | 12n |  1  1   2 | 1  2  2  1 | 2 1 1
--------+-----+-----------+------------+------
x . . . |   2 | 6n  *   * | 1  2  0  0 | 2 1 0
. x . . |   2 |  * 6n   * | 1  0  2  0 | 2 0 1
. . x . |   2 |  *  * 12n | 0  1  1  1 | 1 1 1
--------+-----+-----------+------------+------
x6x . . |  12 |  6  6   0 | n  *  *  * | 2 0 0
x . x . |   4 |  2  0   2 | * 6n  *  * | 1 1 0
. x x . |   4 |  0  2   2 | *  * 6n  * | 1 0 1
. . xno |   n |  0  0   n | *  *  * 12 | 0 1 1
--------+-----+-----------+------------+------
x6x x . ♦  24 | 12 12  12 | 2  6  6  0 | n * *
x . xno ♦  2n |  n  0  2n | 0  n  0  2 | * 6 *
. x xno ♦  2n |  0  n  2n | 0  0  n  2 | * * 6