Sindarin is a fictional language invented by J.R.R. Tolkien and spoken by the Grey-elves or Sindar in his books about Middle-earth (The Hobbit, The Lord of the Rings, The Silmarillion, etc). Sindarin is loosely based on Welsh and was originally called Gnomish.
Tolkien also created a number an alphabets to write Sindarin - Tengwar, or Feanorian letters. There are a number of different ways or modes in which it is used to write Sindarin.
Tengwar numerals are written from right to left.
Ennyn Durin aran Moria: pedo mellon a minno!
Im Narvi hain echant. Celebrimbor o Eregion teithant i thiw hin.
Gate of Durin, King of Moria, say friend and enter!
I, Narvi made them. Celebrimbor of Eregion drew these signs.
(inscription on the Gate of Moria)