Science Fair Project Encyclopedia
Although not technically a dagger, the rondel, a stabbing weapon with triangular or rectangular cross-section, is commonly included in the term.
Some daggers also have weighted blades, and are meant for throwing at enemies. The weighted blade provided momentum and accuracy.
The earliest daggers appear in the Bronze Age, in the 3rd millennium BC, predating the sword, which essentially developed from oversized daggers. Daggers were important secondary weapons in Europe during the Middle Ages and the renaissance.
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