契丹大字
Nova N 176 is an undeciphered manuscript codex held at the Institute of Oriental Manuscripts (IOM) of the Russian Academy of Sciences in Saint Petersburg, Russia. The manuscript, of uncertain provenance, entered the collection of the IOM in 1954, and for more than fifty years nobody was able to identify with certainty what language or script the text of the manuscript was written in. It was only in 2010 that IOM researcher Viacheslav Zaytsev was able to demonstrate that the manuscript is written in the Khitan large script, one of two largely undeciphered writing systems used for the now-extinct Khitan language during the 10th–12th centuries by the Khitan people, who founded the Liao Empire in north-eastern China.