LIT SIGN' A 'LIT SIGN' is a type of ILLUMINATED sign, typically used for advertising or to provide directions. It is usually made up of a light source, such as fluorescent or LED bulbs, and a translucent panel with a design or message printed on it. The light source is usually mounted behind the panel, so that the design or message is visible when the sign is ILLUMINATED. The term 'LIT SIGN' is derived from the word 'LIT, ' which means 'ILLUMINATED.'