暗黒星雲: a type of interstellar cloud that is so dense that it obscures light from background stars; a dark nebula

songbun (a system of ascribed status in North Korea, based on one's political, social, and economic background and the behaviour of relatives)

出身成分: songbun

(oceanography) the North Atlantic Current

(marine biology) Synonym of ネクトン (nekuton, “nekton”)

marine biology

sex reassignment surgery; gender confirmation surgery

proportional representation

transgender person

(mathematics) equilateral triangle