What is the term for a javelin-throwing engine in ancient warfare?

The term for a javelin-throwing engine in ancient warfare is "scorpio." This type of artillery was designed to launch a spear or javelin, making it effective for both siege warfare and open combat. Unlike other engines, which may have operated with different mechanisms or for different types of projectiles, the scorpio was specifically known for its ability to fire projectiles accurately over considerable distances.

In contrast, while the catapulta is another type of ancient siege engine, it was typically used to launch larger stones rather than javelins. The ballista, similarly, is a torsion-powered artillery piece that launched larger bolts, somewhat akin to a giant crossbow. The term "aries" refers to a battering ram used to break down gates or walls, representing a different class of siege weapon entirely. Thus, the scorpio is distinct in its designation and function as a javelin-throwing device in ancient military technology.