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Related to set-in: well set
1. A horizontal ledge on a wall (or other member or construction), marking a decrease in its thickness above; also called a watertable.
2. A bend in a pipe.
3. A change in the direction of a pipeline (other than 90°), e.g., by a combination of elbows or bends, which brings one section of the pipe out of line with but into a line parallel to another section.
4. A short line perpendicular to a surveyed line, measured to a line