Nouns that denote specifically male persons (or animals) are normally of masculine gender; those that denote specifically female persons (or animals) are normally of feminine gender; and nouns that denote something that does not have any sex, or do not specify the sex of their referent, have come to belong to one or other of the genders, in a way that may appear arbitrary. Examples of languages with such a system include most of the modern Romance languages, the Baltic languages, the Celtic languages, some Indo-Aryan languages (e.g., Hindi), and the Afroasiatic languages.