Palladium Palladium Palladium is a chemical element with symbol Pd and atomic number 46. It is a rare and lustrous silvery-white metal discovered in 1803 by William Hyde Wollaston. He named it after the asteroid Pallas, which was itself named after the epithet of the Greek goddess Athena, acquired by her when she slew Pallas. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). These have similar chemical properties, but palladium has the lowest melting point and is the least dense of them. More than half the supply of palladium
Named set theory in which X and I are two constructive objects, for example, sets of words, and A is an algorithm that transforms X into I. In an algorithmic definition, a named set A = ("X", "A", "Y") consists of an algorithm "A", the set "X" of inputs, and the set "Y" of outputs. A name is given to a person, place, or thing to identify it. For example, parents can give their child a name or scientist can give an element a name. Examples of named sets include, Henri Poincaré (1908) wrote that without a name no object exists in science