Triangular-hendecagrammic duoprism

The triangular-hendecagrammic duoprism, also known as the 3-11/3 duoprism, is a uniform duoprism that consists of 11 triangular prisms and 3 hendecagrammic prisms, with 2 of each meeting at each vertex.

The name can also refer to the triangular-small hendecagrammic duoprism, triangular-great hendecagrammic duoprism, or triangular-grand hendecagrammic duoprism, which each use different stellations of the hendecagon.

Vertex coordinates
The coordinates of a triangular-hendecagramic duoprism, centered at the origin and with edge length 2sin(3π/11), are given by:
 * (0, 2sin(3π/11)$\sqrt{2}$/3, 1, 0),
 * (0, 2sin(3π/11)$\sqrt{3}$/3, cos(2π/11), ±sin(2π/11)),
 * (0, 2sin(3π/11)$\sqrt{3}$/3, cos(4π/11), ±sin(4π/11)),
 * (0, 2sin(3π/11)$\sqrt{3}$/3, cos(6π/11), ±sin(6π/11)),
 * (0, 2sin(3π/11)$\sqrt{3}$/3, cos(8π/11), ±sin(8π/11)),
 * (0, 2sin(3π/11)$\sqrt{3}$/3, cos(10π/11), ±sin(10π/11)),
 * (±sin(3π/11), –sin(3π/11)$\sqrt{3}$/3, 1, 0),
 * (±sin(3π/11), –sin(3π/11)$\sqrt{3}$/3, cos(2π/11), ±sin(2π/11)),
 * (±sin(3π/11), –sin(3π/11)$\sqrt{3}$/3, cos(4π/11), ±sin(4π/11)),
 * (±sin(3π/11), –sin(3π/11)$\sqrt{3}$/3, cos(6π/11), ±sin(6π/11)),
 * (±sin(3π/11), –sin(3π/11)$\sqrt{3}$/3, cos(8π/11), ±sin(8π/11)),
 * (±sin(3π/11), –sin(3π/11)$\sqrt{3}$/3, cos(10π/11), ±sin(10π/11)).