Which term describes the component of a ladder that spans across its beams?

The term that describes the component of a ladder which spans across its beams is "rung." Rungs are the horizontal members of a ladder that provide the steps for a firefighter or user to climb up or down the ladder safely. They are positioned between the two vertical components, known as the beams, and are crucial for supporting the weight of the individual using the ladder.

Rungs are typically designed to be non-slip to ensure safety, especially in emergency situations where a firefighter may be working under challenging conditions. The materials and construction of rungs also contribute to the overall strength and stability of the ladder, as they need to support considerable weight and force without bending or breaking.

The other terms listed relate to different components or features that do not specifically span the beams. For instance, a spur refers to the additional structural elements that may stabilize the ladder, while a block may pertain to components used in raising and securing the ladder. A plate is generally associated with parts of the ladder that may help with anchoring but does not span across the beams like a rung. Understanding these specific definitions is important for equipment identification and practical application in firefighting scenarios.