Keris is an asymmetrical dagger with distinctive blade-patterning achieved through alternating laminations of iron and nickelous iron (pamor). Keris is famous for its distinctive wavy blade, although many have straight blades as well, and is one of the weapons commonly used in the pencak silat martial art.

A keris can be divided into three parts: blade (bilah or wilah), hilt (hulu), and sheath (warangka). Each part of the keris is considered a piece of art, often carved in meticulous detail and made from various materials: metal, precious or rare types of wood, or gold or ivory.