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  • ISO 4157 is an ISO standard for construction drawings and designation systems. It is composed of 3 parts: ISO 4157-1:1988 "Construction drawings -- Designation systems -- Part 1: Buildings and parts of buildings" ISO 4157-2:1988 "Construction drawings -- Designation systems -- Part 2: Room names and numbers" ISO 4157-3:1988 "Construction drawings -- Designation systems -- Part 3: Room identifiers" Main definitions: Floor n: is the horizontal partition between storey n and storey. Note: the floor in storey 5 is named as floor 4. Room: Identifiable physical space bounded actually or theoretically, even though it is not traditionally thought of as a room. Room identifiers: registration number of spaces: Room numbers: numbers of rooms Standard samples: