"Mixed signs [of the three parts of the universe]" (Tzu tzu) - a monument of the XII century. from the famous Tangut collection of the St. Petersburg branch of the Institute of Oriental Studies of the Russian Academy of Sciences. This text, which was considered as a source of decryption of the Tangut script, presents the keywords of the Tangut culture, located in three traditional categories of the universe - "Sky," "Earth," "Man."