a mostly obsolete practice of edging a flag in a different color than the field, either for decorative purposes or to prevent fraying.

A different-colored edge around the outside of the flag, or part of a flag.

Automatically locating the correct edge of an image on a scan so that marking from the edge, frame, etc is not capture.

used when referring to squares on Earth; square B borders square A if square B lies within the Movement Range and/or Sea-faring Range of the population in square A