It is called an octagonal prism
heptagonal prism
pentagonal prism
A pyramid with 18 edges would be called a nonagonal pyramid. A prism with 18 edges is called a hexagonal prism.
A prism. A rectangle is a special kind of prism. It is called a cuboid.
An hexagon
Suboxone
It could be called a pentahedral prism.
It is called an octagonal prism
heptagonal prism
It is 0.01543
pentagonal prism
pentagonal prism
A pyramid with 18 edges would be called a nonagonal pyramid. A prism with 18 edges is called a hexagonal prism.
An octagonal prism.
It is a Triangular Prism.
It is called a cuboid.