The kris or keris is a Javanese asymmetrical dagger with a distinctive blade-patterning achieved through alternating laminations of iron and nickelous iron (pamor). The kris 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 native to Indonesia. Kris have been produced in many regions of Indonesia for centuries, but nowhere—although the island of Bali comes close—is the kris so embedded in a mutually-connected whole of ritual prescriptions and acts, ceremonies, storied backgrounds, and epic poetry as in Central Java. Within Indonesia the kris is commonly associated with Javanese culture, although other ethnicities in it and surrounding regions are familiar with the weapon as part of their cultures, such as the Balinese, Sundanese, Malay, Madurese, Banjar, Buginese, and Makassar people. The kris itself is considered as a cultural symbol of Indonesia and also neighbouring countries like Brunei, Malaysia, Philippines, Singapore, and Thailand.
A kris can be divided into three parts: blade (bilah or wilah), hilt (hulu), and sheath (warangka). Each part of the kris 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. A kris's aesthetic value covers the dhapur (the form and design of the blade, with around 60 variants), the pamor (the pattern of metal alloy decoration on the blade, with around 250 variants), and tangguh referring to the age and origin of a kris. Depending on the quality and historical value of the kris, it can fetch thousands of dollars or more.