The atrioventricular valve on the left side of the heart is the bicuspid or mitral valve. The AV valve on the right is the tricuspid.

Your answer is in the name of each valve actually. The left atrioventricular valve (AV) can also be called the bicuspid valve and the right atrioventricular valve can also be called the tricuspid vavle. If you think back to what you may have learned in Anatomy and Physiology 1, a word that has "uni" attached to the front of it usually means one or single, a word that has "bi" attached to the front of it usually means two or double, and a word that has "tri" attached to the front of it usually means three or triple.

So to answer your question, the left atrioventricular valve, which is also known as the bicuspid valve has two cusps and the right atrioventricular valve, which is also known as the tricuspid valve has three cusps.

one has three cusps (tri) and the other has two (bi)

Right atrioventricular valve

The Tricuspid valve