Demon core, a spherical subcritical mass of plutonium manufactured during World War II by the United States as a fissile core for an early atomic bomb

racquetball

dog year

(computing) cartridge (ink or toner container)

A transliteration of the Russian surname Зеле́нский (Zelénskij) / A transliteration of the Ukrainian surname Зеле́нський (Zelénsʹkyj)

warning

(education) workbook

snack mix of kaki no tane (柿の種) and peanuts

rescheduling

to reschedule