most influential weapon

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This is a fairly simple topic that I'm creating out of sheer boredom. What is the most influential non-Nuclear weapon ever created? It doesn't necessary have to be a weapon, it could even be a TYPE of ammunition, such as the SABOT round. Or even a missile of sorts. Anything that isn't a nuclear war-head or bomb counts, because undoubtedly the nuclear weapon is the most influential thing of the 20th century.