Angerthas was a term for Runic writing. There were numerous variants, but the two principal forms were the Angerthas Daeron, used by the Elves to represent Sindarin, and the Angerthas Moria, the classical form used by the Dwarves, which was further evolved to Angerthas Erebor.
- It is likely that the c in cirth transforms to a g because of Sindarin lenition.
- J.R.R. Tolkien, The Lord of the Rings, Appendix E, "Writing", "The Cirth"
- J.R.R. Tolkien, Christopher Tolkien (ed.), The Silmarillion, "Appendix: Elements in Quenya and Sindarin Names", entry an(d)
- J.R.R. Tolkien, "Words, Phrases and Passages in Various Tongues in The Lord of the Rings", in Parma Eldalamberon XVII (edited by Christopher Gilson), p. 122
- Compound Sindarin Names in Middle-earth at Tolkiendil.com (accessed 21 July 2011)