The term KIN OF ARGON is referring to the element XENON, which is a noble gas with 5 letters. XENON is a chemical element in the periodic table that has the atomic number 54. It is a colorless, odorless, tasteless noble gas that occurs in the Earth's atmosphere in trace amounts. XENON is found in the Earth's crust in compounds known as XENON compounds. It is used in a variety of applications, including lighting, lasers, and medical imaging.