 Philosophical work on language from the mid-20th century, such as that of J.L.Austin and the ordinary language philosophers, has provided much of the originary inspiration for the study of indexicality and related issues in linguistic pragmatics (generally under the rubric of the term "deixis"; see above), though linguists have appropriated concepts originating in philosophical work for purposes of empirical study, rather than for more strictly philosophical purposes.However, indexicality has remained an issue of interest to philosophers who work on language.