Icosahedron

Plato associated the icosahedron with water, because it  flows out of one's hand when picked up, as if it is made of tiny little balls

The icosahedron is a platonic solid made out of 20 congruent triangles.
It has 30 edges and 12 vertices. At each vertex 5 faces meet.

 

 

 

It's net:

 

To view the 3D version:
https://www.mathsisfun.com/definitions/icosahedron.html