1Hobo Secret Code
Hobos have secret codes called the Hobo Code that was drafted at an 1889 Hobo Convention in St. Louis to help other hobos and also to warn them of dangers in the area. For example, their symbol for "kindhearted lady" is a cat.
2. Tanker trucks transporting dangerous goods are labelled with UN numbers. There are lots of these numbers, but the useful ones are these. 1202 means diesel, 1203 is for gasoline, 1075 is for propane, 1267 is for crude, 1993 is for anything flammable,
3. "Friend of Dorothy" was code popular in the 80's, which gay men used for secretly identifying each other. The higher ups in the Navy believed that there actually was some woman named Dorothy at the center of a massive ring of homosexual military personnel, so they launched an enormous and futile hunt for the elusive "Dorothy".
4. Flippable yellow signs which you may sometimes in commonly in Hollywood and sometimes in other cities are secret-coded directions for actors to get to filming locations. They often feature insider jokes like: "Freezer Burn" signs pointing to the Captain America shoot (a reference to him being put on ice)
5. The lamp posts in Central Park in Manhattan have secret codes on their base so that you won't get lost. The newer street lights have a code that is similar to C8202. C meaning center drive (W and E meaning West or east respectively). 82 meaning the closest street is 82 st. And the last 2 numbers meaning the pole in that area as it corresponds to a map.
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6Obituaries Secret Code
Obituaries have long employed a secret code, a shorthand to mask causes of death that survivors found embarrassing. When HIV/AIDS began claiming lives in the 1980s, young men were said to have simply succumbed to "pneumonia." There is also a code for gay men that says they were "Unmarried" or "Confirmed bachelor." The codes “died at home” or “died suddenly” or simply “passed away” come out when there’s a drug overdose or a suicide.
7. Violets represented a secret code between lesbians, identifying them among heterosexual peers, and in films. The tradition originated from Sappho’s poetry in 600 B.C.
8. 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.
9. 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.
10. When a motorcyclist taps his helmet it means there are cops up ahead.
11Dr. Strong
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.
12. "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.
13. 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.
14. 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.
15. "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
16Deadhead
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.
17. Code Pink in some hospitals can mean a missing baby, and the initiation of an all-staff response.
18. Any US aircraft using the code name "FLYNET" indicates that an aircraft is transporting a nuclear emergency team or a disaster control team to the location of a potential or actual nuclear accident or an accident involving chemical agents or hazardous materials.
19. In online dating ads, if the girl mentions to bring roses, it is code for money and means she's a prostitute.
20. In hospitals and medical facilities, they have security investigate fire alarms before calling in the fire department unless the sprinkler system actually goes off. Since they cannot announce over the PA system that the fire alarm is going off, they "Page Mr. Gallagher" to a location. This is the code for security to investigate that location for a potential fire.
21Time Check Code
If you hear a time check announced over a loudspeaker in a store (it may sound like, “Time check, the time is 1:30″) it means there’s a bomb threat.
22. Some hospitals, particularly in the US, use ‘Doctor Brown’ as a code to protect doctors and nurses, alerting them to the threat of violent patients in the vicinity. In some cases, paging ‘Doctor Brown’ will automatically send for security to come to their aid. Although the exact phrase used can vary, ‘Code Silver’ may indicate that the attacker is armed.
23. The color of twist tie on your bread bag indicates which day of the week that bread was made. This makes it easy for grocery stores to spot aging bread on the shelves. Monday – blue, Tuesday – green, Thursday – red, Friday – white, Saturday – yellow, Sunday and Wednesday are off.
24. On cruise ships a crew announcement calling for "Operation Bright Star" denotes a severe medical emergency requiring immediate attention, while "Operation Rising Star" means a passenger has passed away.
25. A doctor may refer to a suspected case of tuberculosis as "Koch's disease" in order to avoid alarming patients.
