A neon sign advertising beer
A neon sign is an electrified, luminous tube light that contains neon or, sometimes, other gases.
Some bars on Earth during the 20th and 21st centuries sometimes had neon lights on their walls which were used to advertise various alcoholic beverages. In 1957, Pine Tree Bar and Grill in Carbon Creek, Pennsylvania, was one such example. (ENT: "Carbon Creek")
A neon sign was used in 2004 to advertise a cafe in an apartment block in Detroit, Michigan. (ENT: "Carpenter Street")