20 David means a radio call sign that is from the TV show S.W.A.T, which refers to the first of the sergeants in the David unit, which makes him the leader of the squad.
The "20" is the rank number for the second in command sergeant, and David is the phonetic alphabet for the letter D, which also designates a specific unit.
It's also often used to refer to the team leader of the David Squad Sergeant Danial Hondo Harrelson.
Code 7 for cops means "out of service for a meal break".
Code 7 for cops is a signal that means an officer or cop is unavailable to respond to calls because the cop or officer is taking a break to eat.
The code 7 for cops is part of the 10-code system, in which the code 10-7 also means out of service.
10-8 code means that the cop or officer is back in service or available to take calls again.
Some police systems also use signal 7 as a way to mean dead body.
A 999 cop code is the emergency radio signal for "officer needs help,".
The 999 cop code or police code is used by law enforcement to request immediate assistance.
The primary meaning of the 999 cop code for many police agencies is that a cop is in immediate danger and needs backup urgently, which is similar to the 10-33 police code or Code 3 police code.
In the UK or United Kingdom, 999 is the standard emergency number for calling police, fire and rescue service or ambulance service.
Instead of 911 in the United States, the number is 999 in the United Kingdom.
The meaning of the 999 police or cop code can also vary by state and police department.
Although the 999 cop code by a police officer or deputy, can mean shots fired, officer down, all available units to respond to assist etc.
Gibraltar also adopted the 999 emergency number in 2024, which aligns with the UK.
And in Europe the emergency number is 112.
112 is the European emergency number you can dial free of charge from fixed and mobile phones everywhere in the EU.
It will get you straight through to the emergency services – police, ambulance, fire brigade.