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 (sometimes, triqueta) is a tripartate symbol composed of three interlocked vesica pisces, marking the intersection of three circles. It is most commonly a symbol of the Holy Trinity (Father, son, Holy spirit) used by the Celtic Christian Church, sometimes stylized as three interlaced fish: