Tengwar is the script J.R.R. Tolkien created for writing languages including Quenya.
Tolkien designed Tengwar as a writing system with distinct letter forms and a flexible system of vowel signs. In the fictional history of Middle-earth, the Elf Fëanor is credited with creating it, while Tolkien supplied the linguistic and graphic detail behind the presentation readers see.
Tengwar appears in different modes adapted to different languages. Examples include modes for Quenya and Sindarin, so the same broad script can represent different sound systems. This is why Tengwar inscriptions may look related while following different spelling conventions.
Cirth is the main alternative here: Tolkien also developed that angular runic script, especially for use by Dwarves and other peoples. Sarati is an earlier Elvish writing system in Tolkien’s mythology, while Angerthas refers to rune arrangements. These names are related, but they are not interchangeable with Tengwar.