Uniques

A Unique is a piece of equipment that has been upgraded to the limit, and then further modified with additional abilities and boosts. They are essentially unique to the unit that wields it - and to reflect this, a name is given to each Unique by its wielder.

This is not to say that two Uniques with identical abilities cannot exist - it would be unfair to limit them like that. However, it's unlikely that two people will have the exact same desires for their kit, and as such their chosen abilities will likely differ.