Bar sign : Bar neon signs are another extremely used neon business sign. A bar sign can be used outside a bar, pubs and clubs. The word bar is usually made using uppercase letters. Bar signs have been used for several decades to i nvite customers to relax with their favorite drink. Pizza : There are approximately 75 thousand pizza shops in the USA making it the most popul ar fast food in the country. Therefore it must not come to you as a surprise that pizza signs are one of the most popular neon business signs. You can see this neon business sign outdoors that is used to invite people to have a bite of one of the most popu lar fast foods. Other popular signs include coffee, beer, and hotel.