Sui generis
Sui generis (; ) is a Latin phrase that means "of its (his, her, their) own kind; in a class by itself; unique."
Pater familias
Women emancipated from the "potestas" of a "pater familias" were independent by law ("sui iuris") but had a male guardian appointed to them. A woman "sui iuris" had the right to take legal action on her own behalf but not to administer legal matters for others.