J.R.R. Tolkien created many languages throughout his life. He wrote in one of his letters that the tales of Middle-earth (The Hobbit, The Lord of the Rings and The Silmarilion) grew from these languages, rather than the languages being created for use in the stories.
Tolkien also created a number of different alphabets to write his languages - the Sarati alphabet only appears in a small number of inscriptions in the tales of Middle-earth.
Information about Sarati (includes a free font)
Information on how Sarati can be used to write Quenya
Tolkien's Middle-earth alphabets, by Dan Smith
Hebrew modes for Sarati, by Yehuda Ronen
Sarati typewriter, by Ethan Deneault
Ancients' Alphabet, Ath, Atlantean, Aurek-Besh, Cirth, Daedric, D'ni, Dragon Runes, Futurama Alien Alphabet, Gargish, Gnommish, Golic Vulcan, Halo Covenant alphabet, Hylian syllabary (Old), Hylian syllabary (Modern), Hylian alphabet, Klingon, Kryptonian, Marain, Matoran, Romulan, Sarati, Standard Galactic Alphabet, Tsolyáni (Tékumel), Tenctonese, Tengwar, Utopian, Visitor, Zentlardy
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