Tengwar is the Tolkien-created script designed by Fëanor for writing Quenya and other languages.
Within Tolkien’s legendarium, Fëanor devised the Tengwar in the First Age. The script was later adapted for several languages, including Quenya and Sindarin, rather than functioning as an alphabet tied to only one spoken language.
Tengwar is an abugida-like writing system in many presentations: consonant symbols carry the main information, while vowel marks are placed above or around them. Tolkien developed different modes, so the exact values of signs depend on the language being written.
Tengwar is often confused with Cirth, another script in Tolkien’s world. Cirth consists mainly of angular runes and was associated especially with Dwarves, while Tengwar has the flowing forms commonly seen in inscriptions and fan transcriptions.