The game has a unique double class and skill system.

Thus hydraulophones form a unique class of instruments in which sound is actually produced by the water itself.

The school offers many unique and different classes, ranging from astronomy to television production.

The unique qualitative classes listed above can be visualized.

Most major story characters have their own unique classes.

What put him in a unique class was that at age forty he'd never been married.

This was a unique class that was created in order to increase the education and literacy of North Korea.

Like Themisto, this moon seems to be the lone member of a unique class, which makes it particularly interesting.

Instead, it has two unique classes of proteins called amelogenins and enamelins.

In 2010 it featured 4 rings with 63 unique classes.