The seal or stamp a licensed engineer or architect places on drawings and documents to take legal responsibility for the design shown.
A professional seal, often called an engineer's stamp, is the mark a licensed engineer, architect or surveyor places on drawings, calculations and specifications to show that they take professional and legal responsibility for the work shown. Where the law requires it, sheets submitted for permits or construction are not valid without it.
The seal belongs to a person, not a firm, and to a jurisdiction. A structural engineer licensed in one state can't seal drawings for a project in another state without being licensed there. Sheets are sealed when issued for permit or construction; preliminary issues often carry "Preliminary, not for construction" instead. Changes after sealing require a new revision and a new seal.
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