deictic
adjective
deic·tic ˈdīk-tik 
also ˈdāk-
: showing or pointing out directly
the words this, that, and those have a deictic function
Word History
Etymology
Greek deiktikos able to show, from deiktos, verbal of deiknynai to show — more at diction
First Known Use
1876, in the meaning defined above