From International Dictionary of Marine Aids to Navigation
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Abstract concept of a building or artefact. It can exist in the mind or on paper and if realised, it can be represented in the building or artefact itself.

Reference: Stirlingcharter

(This definition was noted at the IALA Seminar on the Practical Aspects of Lighthouse Preservation in Gothenburg 2005)

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM