Roller chain or bush roller chain is the type of chain drive most commonly used for transmission of mechanical power on many kinds of domestic, industrial and agricultural machinery, including conveyors, wire- and tube-drawing machines, printing presses, cars, motorcycles, and bicycles.
Pietra dura (Italian: [ËpjÉËtra ËduËra]) or pietre dure [ËpjÉËtre ËduËre] (see below), called parchin kari or parchinkari in South Asia, is a term for the inlay technique of using cut and fitted, highly polished colored stones to create images. It is considered a decorative art.
The triquetra is a three part ancient symbol comprised of three interlocked vesica pices, often used to represent people or concepts in groups of three. Also known as the trinity knot and Celtic triangle, it has been found in Celtic art, paganism and also has been used in Christianity.