The book offers the first full-scale focused treatment of linguistic indexicality as a tool for analysis and explanation of the organization of linguistic structures. The book demonstrates the application of the concept of indexicality in the description of a broad range of linguistic phenomena, from the internal workings of morphology via relations within syntactic constructions to lexical and grammatical elements designed to hook on to features outside the clause in the interactional context. The book offers a focused treatment of the general nature of linguistic indexicality in the larger perspective of the semiotics of language, including examinations of domain-straddling indexical functions. It presents studies of the role of indexicality in synchrony and diachrony with descriptive cases from a number of languages from diverse language families and it examines the way indexicality enters into the mechanisms of change, including examinations of semiotic shifts from indexical to symbolic function and vice versa. The book is relevant for researchers and students in historical and synchronic linguistics from a variety of linguistic frameworks with an interest in the role of semiotics in linguistic analysis.