The Elvish script J.R.R. Tolkien created for writing many Middle-earth languages is called Tengwar.
Tengwar is a writing system rather than a single spoken language. Tolkien designed its letter forms and detailed rules to represent sounds in languages including Quenya and Sindarin. The script appears in books, illustrations, and inscriptions connected with Middle-earth, including the One Ring inscription.
The word tengwar means “letters” in Quenya. Tolkien's system is especially notable because its characters can be adapted to different phonetic values depending on the language and writing mode being used.
Readers sometimes confuse Tengwar with Cirth, another Tolkien script. Cirth uses angular runic forms and was associated particularly with Dwarves, while Tengwar has the flowing shapes commonly recognized from Elvish inscriptions. Sarati is an earlier writing system in Tolkien's invented history, not the same script.