stereo
Sound! It normally mode of propagation IS in three dimensions.
Three dimensional picture
A three-dimensional map is also known as a topographical map.
A two-dimensional shape with three sides is a triangle. A three-dimensional shape with three faces is a cylinder.
There is none you idiot
A cuboid.
A cube.
A double helix
decahedron
sphere
triacontahedron
The regular dodecahedron is the 3-dimensional analog of a regular pentagon. In other words, it is a three-dimensional pentagon.