Cirth is the Dwarvish runic writing system created by J.R.R. Tolkien.
The Cirth are angular characters designed for carving inscriptions into wood, stone, or metal. Tolkien’s fictional history says that the Elves of Beleriand first developed the early forms, while the Dwarves later adapted and expanded them for their own use.
The term “Cirth” refers to the runes themselves and is related to a Sindarin word meaning “runes.” The expanded arrangement used by the Dwarves is known as the Angerthas Moria or Angerthas Erebor in different historical contexts.
Tengwar is a separate writing system, associated especially with the Elves and created by Fëanor. Sarati is an earlier script in Tolkien’s invented writing history. Angerthas is a system or arrangement based on the Cirth, so it is not the simplest canonical answer to the general question.