The Senzar language is a fictional language system which was first suggested by the Theosophist Helena Petrovna Blavatsky. H.P. Lovecraft and other Cthulhu Mythos authers used the language in their stories.
The Senzar language and its script were the language system used by the pre-human inhabitants of Atlantis. Senzar appears to have been written using a cuneiform-like lettering system. It is believed that a few of the Lamas of Tibet know of this language through their studies of certain obscure philosophical doctrines.
The best known example of the Senzar language is the Book of Dyzan; a volume which suposedly contains the wisdom of the lost peoples of Atlantis. It was after first seeing this volume that Helena Petrovna Blavatsky founded the Theosophy Society. The The Book of Eibon was also translated into Senzar by the sorcerer Klarkash-Ton. No copies of this translation are believed to have survived into the present day.
Original examples of Senzar text may survived, preserved within the walls of the lost city of Kuturis. The exact location of this city is unknown though it is likely to be somewhere in the Sahara.