(trigonometry) cosecant

mutetrahedron

muoctahedron

Kyūjitai form of 六角四片四角孔ねじれ正多面体: muoctahedron

Kyūjitai form of 六角六片三角孔ねじれ正多面体: mutetrahedron

Alternative spelling of 直角三角形 (“right-angled triangle”)

one-eyed goblin, a Japanese monster

(trigonometry) hacoversine; hacoversed sine

“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds