A torii is a traditional Japanese gate most commonly found at the entrance of or within a Shinto shrine, where it symbolically marks the transition from the mundane to the sacred and a spot where kami are welcomed and thought to travel through.
A torii at the entrance of Tatsuta Shrine, a Shinto shrine in Sangō, Nara
The famous torii at Itsukushima Shrine
Buddhist goddess Benzaiten, a torii visible on her head
An Indian torana
A Shinto shrine is a structure whose main purpose is to house ("enshrine") one or more kami, the deities of the Shinto religion.
Two women praying in front of a shrine
Mount Nantai, worshiped at Futarasan Shrine, has the shape of the phallic stone rods found in pre-agricultural Jōmon sites.
An example of jingū-ji: Tsurugaoka Hachiman-gū-ji in an old drawing. In the foreground the shrine-temple's Buddhist structures (not extant), among them a pagoda, a belltower and a niōmon. The shrine (extant) is above.
Mount Fuji is Japan's most famous shintai.