The term SIGN GASES is composed of two words, NEONS (5 letters) and SIGN (4 letters). Neons are a type of gas that is used in signs and other lighting applications. They are composed of neon, argon, and other noble gases, and when electricity is applied to them, they emit a bright light. SIGN gases are used in many types of signs, including neon signs, which are popular for their bright colors and long-lasting illumination.