What is defined as a device or material capable of causing death or serious injury, excluding certain pocket knives?

The term that is defined as a device or material capable of causing death or serious injury is known as a dangerous weapon. This classification encompasses a variety of items that are designed or can be used with the intent to inflict harm or endanger lives. By specifying that it excludes certain pocket knives, the definition emphasizes that not every object typically viewed as a weapon falls under this category; rather, it focuses on those that are inherently dangerous or intended for harm.

The other terms do not encapsulate this definition effectively. A prohibited item usually refers to things that are not allowed in certain contexts or environments but does not explicitly convey the inherent danger. A firearm specifically refers to guns and does not include other types of dangerous items. Meanwhile, a simple tool is typically an item used for practical purposes without any intention of causing injury, which contrasts with the definition of a dangerous weapon. Thus, dangerous weapon is the most accurate and encompassing term in this context.