The point group symmetry of ammonia (NH₃) is C₃v.

Here's why:

* C₃: The molecule has a threefold rotational axis (C₃) passing through the nitrogen atom and perpendicular to the plane of the three hydrogen atoms.

* σv: It has three vertical mirror planes (σv) that each contain the C₃ axis and one N-H bond.

Let me know if you would like a more detailed explanation of point groups or symmetry elements!