The Japanese festival for children; a traditional rite of passage and festival day in Japan for three- and seven-year-old girls and three- and five-year-old boys, held annually on November 15. As Shichigosan is not a national holiday, it is generally observed on the nearest weekend. Similar to こどもの日 (Kodomo no Hi, literally “Children's Day”)

(idiomatic) someone who cannot stick to anything, someone who gives up easily

tricolour

a calico cat

Used other than figuratively or idiomatically: see 三, 枚, 目. (the third sheet or other flat thing) / a comic character / (by extension) a funny or ridiculous person

using lip service to trick someone

acute triangle (triangle all of the angles of which are acute)

obtuse triangle

the Triassic period

tritium