In military terminology, which factor does the term “field” NOT refer to?

In military terminology, particularly when discussing flags, the term "field" specifically refers to the background area of the flag, which encompasses the primary color or design that covers most of the flag's surface. Thus, when referring to the design of a flag's emblem, it is important to understand that the term "field" does not include the emblem's design as it focuses solely on the overall background color and pattern.

The concept of the field is crucial in flag terminology because it sets the stage for any symbols or designs that are layered over it. Hence, options like the color of the flag and the background area both align with the definition of "field," while the design of the emblem relates to a different aspect of flag symbolism, separating it from the category of what is considered the "field" in flag nomenclature.