Thoth is the Greek rendering of the Egyptian name Djehuty or Tahuti. Thoth was also identified by the Greeks with their god Hermes and was called Hermes Trismegistus to distinguish him from the Greek form of Hermes. The title Trismegistus, meaning “three times great,” is a Greek translation of the Egyptian expression, pa aa, pa aa, pa aa, meaning “the great, the great, the great,” which was often applied to Thoth. He was also sometimes called “twice- great” […] There are even texts that describe him as “eight times great” or “nine times great” The main cult center of Thoth was Hermopolis, which is now called el-Ashmunein. His totem animals are the baboon and the ibis and he is often represented as a man with the head of an ibis.
One of the most important deities of ancient Egypt, he was credited with being a creator god […].
Thoth is the god of wisdom, “lord of the divine words,” and patron of scribes and physicians. […] It is Thoth who is said to have devised hieroglyphic writing, but his role as lord of the divine words probably means more than this: It was Thoth who prescribed the correct practices and appropriate forms of ritual to be carried out in all the temples and the sacred texts used there were written by him. In discussing the importance of Thoth’s writing, Patrick Boylan […] quotes from a hymn that describes Thoth as “he who has given words and script, who makes the temples to prosper, who founds shrines, and who makes the gods to know what is needful (i.e., sacrifice and ritual).”
Thoth is one of several deities to whom special magical powers are attributed; the source of his magic is his great knowledge and his command of words – how to use and pronounce words with magical effectiveness. His medical knowledge is closely connected to his magical abilities.  […]
As god of justice, reason, and balance, Thoth has an important role in the judgment hall of Osiris – where the heart of the deceased is weighed in the scales of Maat to see if he or she is of sufficient moral integrity to be allowed into the blessed afterlife, to live with the gods. He helps Anubis weigh the hearts and carefully records the verdict on his scroll. The text also shows that Thoth “doeth away with opposition and fighting” in that he resolved the dispute between Horus and Set. […] All scientific learning and sacred wisdom was attributed to Thoth, so in principle he was regarded as the author of the great books of knowledge, medicine, sacred texts, and spells that were collected in the temples and handed down for generations. In much later times, the Greek Hermetica were attributed to him under his name of Hermes Trismegistus […]