The article deals with one of the complex issues of terminology – the problem of structural and semantic features of nomenclature signs coined with the help of proper names on the material of the terminological systems of the Anglo-American, international public, European law and the Organization of American States. On the basis of the analysis of the nomenclature units represented by the names of legal precedents, and taking into account the existing classifications of proper names, characteristic features of legal nomenclature signs were revealed.