Pyramids are 3D shapes named according to the shape of their bases.
The faces of the pyramid are triangles and they slope up to a point.

Skeletons of various pyramids can be made by using toothpicks and plasticine, straws and plasticine, straws with pipe cleaners as hinges, pipe cleaners and soft wire.
 

Pyramids are the strongest 3D structure. 

The trick to naming pyramids
 

Base Shape	Sides	Name
Triangle	3 triangular faces	tetrahedron
Square	4 triangular faces	square pyramid
Pentagon	5 triangular faces	pentagonal pyramid
Hexagon	6 triangular faces	hexagonal pyramid
Heptagon	7 triangular faces	heptagonal pyramid
Octagon	8 triangular faces	octagonal pyramid

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