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Off-page connector

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A symbol marking where a line on a schematic continues on another sheet, carrying the reference to the drawing and connector where it resumes.

No facility fits on one sheet. P&IDs and other schematics are cut into sheet-sized pieces, and off-page connectors are the stitching: an arrow-like symbol at the sheet edge, labelled with the destination drawing and continuation reference, with a matching symbol pointing back from the other side. Follow the pair and the line is continuous; the drawing set is a graph, and the connectors are its edges.

Which is why broken connectors matter beyond tidiness. A reference pointing at a superseded sheet, a renumbered drawing, or nothing at all severs the topology — and severed topology has a specific cost in take-off work, where a line that "leaves the page" and is never picked up on the next one becomes quantities counted on neither sheet. Checking connector integrity across a set of hundreds of sheets is exactly the kind of exhaustive, mechanical verification that humans do slowly and reluctantly, and that every revision reopens.

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