Neon is a chemical element with the symbol Ne and atomic number 10. It is a noble GAS that is found in trace amounts in the atmosphere and is used in a variety of applications. The three crossword solutions for the term neon are GAS (3 letters), TETRA (5 letters), and SIGNILLUMINATOR (15 letters). GAS is an acronym for 'gaseous element, ' which is a term used to describe elements that exist as gases at room temperature. TETRA is a prefix meaning 'four, ' referring to the four electrons in the outermost shell of a neon atom. Finally, SIGNILLUMINATOR is a brand name for a type of neon sign, which is a type of illuminated advertising sign that uses neon GAS-discharge tubes.