石弓
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Meanings
1
Refers to a crossbow, including large mounted versions operated by multiple people. Historical weapon.
In medieval battles, the crossbow was an important weapon.
2
stone-dropping net apparatus
Historical defensive device: a net filled with stones placed atop a wall, released by cutting the net to drop stones on attackers. Rare, specialized term.
They set up stone-dropping nets on the castle walls to repel the enemy.
3
Can refer to a slingshot or a catapult. Less common than パチンコ for slingshot; context-dependent.
I remember playing with a slingshot as a child.