The article deals with diversity of language signs in legal terminology. The aim of the article is to show the influence of both linguistic and extra-linguistic factors on the specificity of various linguistic units in the legal terminology. Though all terminological systems possess some similar features, there may be certain traits characteristic only for some of them. As specific systems of signs, legal terminologies show some peculiarities that are discussed in the article from the point of view of oppositions to (...) highlight the semiotic specifics of language units used by lawyers and also the organization of the terminological system under consideration. The oppositions under consideration emerge due to both linguistic and extra-linguistic factors. Extra-linguistic factors determine such oppositions as terminology of law: terminology of jurisprudence, modern terminology: historical terminology, terms: nomenclature signs. Linguistic factors stipulate the opposition of primary and derived terms. A combination of linguistic and extra-linguistic factors determines the following oppositions: native terms: borrowed terms, terms of the basic terminological system: terms attracted from other spheres of knowledge. Within these types of oppositions a number of more specific ones were elicited. The interaction of synchronic and diachronic approaches the article is based on allowed the authors to focus on the permanent semantic properties of the language signs pertaining to tribal customary and modern law, and on those emerging in the course of the evolution of law. (shrink)