The ammonia molecule has a trigonal pyramidal shape
A trigonal pyramid is a molecular geometry with one atom at the apex and three atoms at the corners of a trigonal base. The ammonia molecule has a trigonal pyramidal shape with three hydrogen atoms and an unshared pair of electrons attached to the nitrogen atom. It has 3 bonding pairs and one lone pair. It is a polar molecule and is highly associated because of strong intermolecular hydrogen bonding.
The nonbonding pair of electrons pushes away from the bonding pairs producing a trigonal pyramidal shape. If the central atom with no lone pair is bonded to three other atoms, the molecule will have a trigonal planar shape.