Ballista was an ancient weapon used in warfare that used tension to shoot projectiles. Synonyms for the word "ballistae" include trebuchet, catapult, and mangonel. A trebuchet is a medieval weapon that uses a counterweight to launch projectiles. A catapult is a machine that uses tension, springs, or torsion to hurl projectiles. A mangonel is a type of catapult that uses a single arm to launch projectiles. Other synonyms include onager, scorpion, and giant crossbow. These weapons have been used in numerous battles throughout history, and their destructive capabilities have played a significant role in determining the outcome of those battles.