From Draftsperson.net

• A narrow platform extending out into an auditorium; "models displayed clothes on a catwalk at the fashion show"
• A narrow pathway high in the air, as above a stage or between parts of a building or along a bridge.
• A narrow fixed walkway providing access to an otherwise inaccessible area or to lighting units, light bridges, etc. used above an excavation, around a high building, above the ceiling of an auditorium or theatre, or around a statehouse.

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