NEON' A lighted sign is a sign that is illuminated, usually with NEON or LED lighting. The term 'lighted sign' can refer to any type of sign that is lit up, including EXIT signs. In this case, the crossword solution for the term 'lighted sign' is 'NEON', which is a type of gas-discharge lighting that is used in many signs. NEON lighting is often used in EXIT signs, as it is bright and easily visible in dark environments.