J.R.R. Tolkien created the Tengwar writing system for many of the Elves in Middle-earth.
Tengwar, also called the Fëanorian characters, is an artificial script used for writing several languages in Tolkien’s legendarium. Its letter forms and writing conventions appear in texts associated with Quenya, Sindarin, and other languages, as well as in inscriptions such as the One Ring’s inscription.
Tolkien designed Tengwar as part of his broader work in invented languages and scripts. It is primarily a writing system, not the name of an Elvish language. That distinction matters because Tolkien created several languages, including Quenya and Sindarin, and a script can be used to represent more than one language.
Cirth is another important Middle-earth script, especially associated with the Dwarves and with runic forms. Sarati is an earlier script in Tolkien’s fictional history. These related names are why Tengwar is sometimes incorrectly treated as a language rather than an alphabetic writing system.