Heptagonal-enneagonal duoprismatic prism

The heptagonal-enneagonal duoprismatic prism or heep, also known as the heptagonal-enneagonal prismatic duoprism, is a convex uniform duoprism that consists of 2 heptagonal-enneagonal duoprisms, 7 square-enneagonal duoprisms and 9 square-heptagonal duoprisms.