Sui generis
Sui generis (; ) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."
Sui generis
When citing cases and other authorities, lawyers and judges may refer to "a "sui generis" case", or "a "sui generis" authority", meaning it is a special one confined to "its own" facts, and therefore may not be of broader application.