Floor plans are designed to show the house from a particular angle, and to a specific scale and level of detail. While they’re very useful, other diagrams are obviously necessary to provide more detail about how certain part of the house need to be laid out or constructed.
Cross reference symbols are used to show which parts of the floor plan correspond to other drawings. The top number on these references refers to the drawing, detail or sequence number in question, and the bottom number tells which sheet number for that drawing.

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