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Wiktionary
throwing knife

n. A knife designed and weighted so that it can be thrown effectively, typically as a weapon or for competitions of knife-throwing skill.

Wikipedia
Throwing knife

A throwing knife is a knife that is specially designed and weighted so that it can be thrown effectively. They are a distinct category from ordinary knives.

Throwing knives are used by many cultures around the world, and as such different tactics for throwing them have been developed, as have different shapes and forms of throwing knife.

Throwing knives are also used in sport.