What is the term for the lateral space between elements on the same line?

The term that refers to the lateral space between elements on the same line is 'interval.' In military formations, especially within the context of the Fleet Marine Force, understanding interval is crucial for maintaining proper spacing between personnel or units. The interval ensures that each element has sufficient room to maneuver while also providing a cohesive and organized appearance during movements or formations.

The concept of interval differs from other terms like distance, which generally refers to the space between elements on different lines, and alignment, which pertains to the positioning of elements along a common line. Spacing is more of a general term that might describe how elements are arranged but does not specifically address the lateral aspect between elements on the same line. Thus, the use of 'interval' is particularly specific and relevant within a tactical context, highlighting its importance in military operations.