The term ATHENIAN T is a crossword solution that can be completed with the three-letter word TAU. The letter 'T' in the term ATHENIAN T stands for the Greek letter TAU, which is the 19th letter of the Greek alphabet. It is often used to represent the last letter of the Greek word 'ATHENA, ' which is the name of the goddess of wisdom, courage, inspiration, civilization, law, and justice in Greek mythology.