The term "Tenno" refers to the Emperor of Japan, a title that has been used for centuries. The Tenno is considered a symbol of the Japanese state and the unity of the people. The current Tenno, Naruhito, ascended to the throne in May 2019, following the abdication of his father, Akihito. The role of the Tenno is largely ceremonial, with no governing power, as Japan is a constitutional monarchy. In addition to its historical significance, "Tenno" is also associated with the popular video game series Warframe. In this game, Tenno are ancient warriors who possess unique abilities and fight against various factions in a futuristic setting. Players control these characters, known for their agility and combat skills, as they complete missions and explore the game's universe.