Stores, hospitals, entertainment venues, and other places where the public are together in large numbers, use secret codes to pass information between store employees. These are meant to be a secret as they don’t want to alarm the non-staff members or alert someone (like a thief) to the fact that they have been noticed. Many stores have their own codes – for example WalMart, but there are a number that are nearly universal in application. This is a list of ten secret codes that may prove useful to you in future, or at least dispel any curiosity you may have if you hear them.
Ten Codes
The Ten Codes are a list of codes used by law enforcement officers in the United States. They are available on the Internet which would make them seem inappropriate for this list, but a large number of police departments have tried to have them made illegal for distribution, so they deserve a mention. The codes were developed initially in 1937 and were expanded in 1974. The California Police use a variety of extra codes which predated the ten codes. For example, a 187 (one eighty-seven) means homicide. In the ten codes system, a 10-31 means that a crime is in progress, a 10-27-1 means homicide (the 10 is usually not said when it is a three-number sequence), and a 10-00 (ten double-zero) means “officer down – all patrols respond. Wikipedia has a complete list of the police codes here.