The Ring-inscription letters in J.R.R. Tolkien’s The Lord of the Rings use the Tengwar script.
Tengwar is an alphabetic writing system devised by Tolkien for the languages of Middle-earth. The inscription on the One Ring is written in Tengwar characters, although the words themselves are in the Black Speech of Mordor rather than in a language created by the script’s name.
The famous text begins “Ash nazg durbatulûk,” meaning “One Ring to rule them all.” Tolkien’s illustration of the inscription helped establish the distinctive appearance readers associate with the Ring.
Tengwar is often confused with Cirth, another Tolkien writing system made from angular runes. Sarati is an earlier script in Tolkien’s invented linguistic history, while Angerthas refers to a related runic arrangement.