Decoding the Obvious: 35 Secrets Hiding in Plain Sight

Code Pink in some hospitals can mean a missing baby, and the initiation of an all-staff response.

If you hear a flight attendant say "deadhead," they're referring to a crew member who is on duty, but is heading home after the flight.

"7500!" You never want your pilot to say or signal this number. It means the plane has been hijacked. Because the meaning of this code has become pretty widespread, many airlines have installed a button or other device in the cockpit that silently switches the plane’s transponder to 7500

Code White' inside a Walmart indicates an accident or incident that requires attention. Once a 'Code White' announcement is made, a Walmart Manager rushes to the area or department where the issue had occurred.

The euphemisms "Rose Cottage" and "Rainbow's End" are sometimes used in British hospitals to enable discussion of death in front of patients, the latter mainly for children. A similar phrase used is: "transferred to ward 13", as hospitals in the UK routinely do not have such a ward.

"Code Adam", is a system at several American retailers that's activated in the event of a missing child. It is named after Adam Walsh (who was murdered) son of John Walsh, former host of America's Most Wanted.

American hospitals may make an announcement calling for "Mr. [or Dr.] Strong", as code to alert orderlies that a patient or visitor at a stated location is in need of physical restraint.

When a motorcyclist taps his helmet it means there are cops up ahead.

In IT support, the code "ID10T" is used humorously to refer to computer errors (pronounced ID ten T) to indicate that the error is the result of the user's stupidity.

Printers print an invisible secret code called Machine Identification Code on every single page you print for the lawmakers to track date, time and serial number of the printer that prints it.