An octahedron, which looks like 2 pyramids glued bottom to bottom.
decahedron
Icosahedron.
A "prism". Note: Prisms actually have five sides. There is no three-sided polyhedron.
solid, polyhedron, and prism for the block looking thing
Double sided carpet tape works well for most indoor and outdoor applications. For instance, if a person wants to keep a floor mat or carpet from sliding around, an application of double sided carpet tape will help hold the mat or carpet in place.
These particles are called electrons - symbol e-, electric charge -1, mass 9.10938291(40)×10−31 kg.
A polyhedron with 20 faces is called an icosahedron.
In general, any 10-sided polyhedron is called a decahedron. With 10 regular triangles for faces, you may have a pentagonal bipyramid.
nonahedron
A one-hundred sided polyhedron is called a hecatohedron, comming from the Greek Hecto- meaning one-hundred and -hedronmeaning a three-dimensional figure.
Octohedron
I believe it called a Bucky Ball. After Buckminster Fuller.
There is no name for a five sided regular polygon. A five sided polyhedron is called a pentahedron.
a polyhedron (if the shape is 3 dimensional) a polygon if it is a planar shape.
Icosahedron.
A 120-sided polyhedron is a hecatonicosahedron.
A shape in 2D with n sides is called an n-gon. In higher dimensions, a shape with n sides is called an n-sided polyhedron.
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.