קֶלַע Strong’s #7050 qela

So David prevailed over the Philistine with a sling and with a stone, and smote the Philistine, and slew him; but there was no sword in the hand of David.

1 Samuel 17:50

The sling was a common weapon carried by shepherds to defend the flock; however, modern versions of a sling are very different from those original weapons. The stones were generally 2 to 3 inches in diameter and carefully chipped into a perfect sphere. It was not slung in circles above the head, but slung in one arc in the same manner as a softball is pitched and could be thrown with very surprising force, accuracy and distance. It is a deadly weapon and was used by most all ancient armies of the Ancient Near East.