Dual

Dual is a grammatical number that some languages use in addition to singular an plural. When a noun or pronoun appears in dual form, it is interpreted as referring to precisely two of the entities (objects or persons) identified by the noun or pronoun. Verbs can also have dual agreement forms in these languages.

The SLOVENE LANGUAGE is the only major Slavic language that retains full grammatical use of the dual, including distinct dual forms for both nouns and verbs (LINK)