10-4 is an affirmative signal: it means “OK.” The ten-codes are credited to Illinois State Police Communications Director Charles Hopper who created them between 1937–40 for use in radio communications among cops. In the 1930s, radio technology was still relatively new and limited.
Message received; OK; acknowledged
The term "10-4," along with its meaning, is part of the "ten code" terms used in law enforcement, the military, and truck driver communications. "10-4" is used to confirm that certain information has been received and will be taken into account.
10-2: Receiving well. 10-3: Stop transmitting. 10-4: Ok, message received. 10-5: Relay message. 10-6: Busy, stand by.
10-9 Repeat last transmission. 10-10 Off duty. 10-10A Off duty at home.
10-20: Your current location. 10-21: Call by telephone. 10-22: Report in person to [location] 10-23: Stand by. 10-24: Completed last assignment.
10-2: Receiving well (I can hear you). 10-3: Stop transmitting (Shut up). 10-4: Affirmative/I agree. 10-5: Relay message (Pass it on).
Police officer retirement
Often when an officer retires, a call to dispatch is made. The officer gives a 10-7 code (Out of service) and then a 10-42 code (ending tour of duty).
10-5 Relay to/from. 10-6 Busy. 10-7 Out of Service.
"Rubber Duck" – The first vehicle in a convoy. "Rubbernecker" – Vehicles that further slow down or impede already congested traffic by rotating their heads 180 degrees to view the accident or traffic incident and not paying attention to the road ahead.
It's a question that can be answered easily, actually. We took inspiration from CB Radio slang. In fact, the following is from CBSlang.com: If you hear a truck driver say “10-20” on their CB radio, it's just another way to say “Your current location.”
Report Conditions (weather) 10-14. Prowler/Burglar. 10-15. Civil Disturbance.
On a film set, 10-1 is the walkie talkie code for the bathroom. While literally meaning you need to pee, using as this as a catch-all saves your film crew from t.m.i. If you find you need more time (maybe the craft services is all beans), just ask to “Upgrade your 10-1.”
According to sources, 12 comes from the police radio code “10-12,” which means thats visitors are present in the area where police are going. It's similar to a warning to police that they might have company when they arrive on the scene.
"Pig" is especially reserved for cops who are regarded as being idiotic or incompetent, corrupt crooks, and violently (or even homicidally) aggressive towards other people.
This particular code is used to indicate an officer's end of tour. While 10-42 is most frequently used when an officer has completed his tour of service for the day, it is also used in conjunction with funeral proceedings when an officer has been killed in the line of duty.
The number “10” is a size designator with no numerical meaning. The number “32” refers to 32 threads per inch. You can identify a 10-32 screw by measuring the diameter at exactly 3/16″ (4.76 mm).
What does 187 mean? 187 is slang for “murder.” 187 is a term associated with hip-hop songs dealing with topics of crime or gang violence.
Unable to care for physical health and safety so as to create an imminently life-endangering crisis and in need of involuntary treatment.
10+2 refers to two years of schooling post grade 10 in India since autumn 2002. In India each state has State secondary education boards. Following are some Boards offering 10+2: Board of High School and Intermediate Education Uttar Pradesh.
What's your 20? is part of a system of radio codes called 10-codes. They developed in the late 1930s when police squads began using two-way radio to communicate. One was 10-20, meaning “location.” Asking What's your 20? emerged as a way to seek another's whereabouts.
"Breaker 1/9" is originally a Citizens' Band radio slang term telling other CB users that you'd like to start a transmission on channel 19, and is the phrase that starts C. W. McCall's 1975 novelty hit "Convoy".
A 10/100 device will allow for an Ethernet data transfer rate of 10 Mbps or the Fast Ethernet speed of 100 Mbps. On a network, 10/100 Ethernet devices are commonly wired to a central hub or switch by utilizing twisted pair wires. With the 10Base-T standard, twisted-pair cable is used to a length of up to 100 metres.