Synonym of 三角錐 (sankakusui, “triangular pyramid”); a tetrahedron

Short for 四輪駆動. four-wheel drive (vehicle)

forty; 40

quadrangular pyramid

(Buddhism) the four stages of existence: 生有(しょうう) (shōu, “moment of birth”), 本有(ほんぬ) (honnu, “life”), 死有(しう) (shiu, “moment of death”), and 中有(ちゅうう) (chūu, “state between death and the next reincarnation”)

(game of Go) ladder

four sixes; twenty-four

four people

(Buddhism) the four kinds of suffering: birth, old age, disease and death

the four gods 青龍(せいりょう) (Seiryō), 朱雀(すざく) (Suzaku), 白虎(びゃっこ) (Byakko), 玄武(げんぶ) (Genbu), imported to Japan from Chinese mythology