Onigiri

Onigiri are rice balls, usually with a tasty filling. おにぎり
Onigiri; a rice ball, which sometimes contains umeboshi, salmon fkake, etc. in its center, often wrapped with a piece of nori sheet.
Onigiri is a savory (salty) rice ball which is formed into an easy-to-eat size and shape such as triangle or circle.
It literally means "hand-pressed(nigiri) rice"