Ununpentium is a chemical element with the atomic number 115. Its symbol is Uup, and it's a highly unstable, radioactive element that has been synthesized only in the laboratory. Due to its unstable nature, there are many synonyms for this element that are commonly used. Some of these synonyms include eka-bismuth, element 115, and moscovium. It was named after Moscow, the capital city of Russia, and its discovery was a result of collaborative research between Russian and American scientists. As an extremely heavy and rare element, ununpentium has little practical use, but its discovery and characterization have contributed significantly to the advancement of science and technology.