SAH Archipedia uses terms from the Getty Art and Architecture Thesaurus (AAT) to categorize and classify metadata for the entries in the database. For more information on the Getty AAT, click here

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nails (fasteners)

Slender and usually pointed and headed fasteners designed for impact insertion.

natural cement

Cement produced by taking finely pulverizing calcined argillaceous limestone and heating it to complete decarbonation, which is the process of removing carbon dioxide.

natural ventilation (systems)

Ventilation systems that depend on natural atmospheric conditions and the manual operation of building openings, such as windows, doors, and transoms.

Naugahyde (TM)

Brand of strong vinyl-coated cloth made to look like leather.

nautilus shell

The shell of the pearly nautilus, Nautilus macromphalus, native to the tropical Pacific and Indian Oceans, used to make decorative objects such as cups, salts, and jewelry, and as carving material.


Inert gaseous element with symbol Ne and atomic number 10; used as the medium in some electric discharge lamps.

neon lamps

Lamps consisting of exhausted glass tubes filled with neon gas that is ionized and conducts an electric current through the tube.


Synthetic rubber made by polymerization of chloroprene and characterized by superior resistance to oil, gasoline, sunlight, ozone, and heat, and by lower permeability to gas than rubber.


Inexpensive, low quality paper made from wood pulp, of the type used chiefly for printing newspapers.

nickel (metal)

Pure metallic element having symbol Ni and atomic number 28; a silvery white metal with a yellowish cast, resistant to corrosion and to most acids except nitric. Use also for this metal as processed and formed, usually in combination with other substances, to make various objects and materials.

nickel silver

Alloy of copper, nickel, and zinc, the nickel serving to enhance color. Uses include operations that require ductility in the cold state, such as stamping, spinning, deep drawing, and for articles to be plated.


Masonry, usually brickwork or stone, used as nonstructural fill in the spaces between major wood wall members in timber construction.

Norway pine (wood)

Wood from the Pinus resinosa, found in North America.

Norway spruce (wood)

Wood of the Picea abies, native to northern Europe and used as a timber and ornamental tree.

Numidian marble

The color of this marble ranges from yellow, light brown, and pink to deep red. It originates not from Numidia proper, but from the mountains of Algeria and Mauritania.


Any of a variety of thermoplastic polymers originally developed as textile fibers and used in fabrics. They have a straight-chain polyamide structure and are largely heat-resistant.

Nyssa sylvatica (species)

Species of tree found in moist areas of the eastern U.S. from Maine south to the Gulf Coast and westward to Oklahoma. Its wood is light and soft, but tough. The black gum is sometimes grown as an ornamental, prized for brilliant scarlet autumnal foliage. The bark dye has good washfastness and fair lightfastness.