Line of Duty returned to our screens on March 21 after a two-year hiatus but fans were left confused after hearing the cast reel off endless acronyms.
The BBC announcer already had to clarify one term, CHIS, after fans mistook it for a rude word.
As the credits rolled at the end of the first episode, the voice-over said: "CHIS, if you're wondering, is a covert human intelligence source."
It came after several viewers pointed out that the pronunciation of CHIS actually sounded a lot like 'jizz'.
However, with the series being a police drama, it comes with an infinite number of acronyms and confusing jargons.
As series six continues we made a list of acronyms so you can tell the difference between your DCs and DCCs.
New acronyms
CHIS - Covert Human Intelligence Source
MIT - Murder Investigation Team
PNC - Police National Computer
TA - Tactical Advisor
Join us for our Line of Duty live chat each Sunday evening from 8.30pm to share the latest theories, twists and turns from the gang at AC12
General acronyms
AC-12 – Anti-Corruption Unit 12
ARU – Armed Response Unit
ARV – Armed Response Vehicle
B&E – Breaking and entering
Blue-on-blue – The accidental shooting/injury of an officer by another police officer
CID – Criminal Investigation Department
CIS – Crime Information System
CPS – Crown Prosecution Service
D&D – Drunk and Disorderly
DIR – Digital Interview Recorder
DPS – Directorate of Professional Standards
DVU – Domestic Violence Unit
ED905 - arbitrary code which represents heroin in season five
GBH – Grievous Bodily Harm
IC – Identification Codes
IC9 – Unknown
ID – Identification
IRTC – Injury Road Traffic Collision
IRV – Incident Response Vehicle Job – A crime, especially a robbery
LEO – Local Enforcement Officer
LIO – Local Intelligence Officer
MIT – Major incident team
MoPI - Management of Police Information
NCPA – No Cause for Police Action
NCS – National Crime Squad
NDIU – National Drugs Intelligence Unit
NOK – Next Of Kin
OCG – Organised Crime Group
OBBO – Observation
OP – Observation Point
PCSO – Police Community Support Officer
RCU – Road Crime Unit
Reg 15 – Regulation 15 notices tells officers that a complaint has been made against them
RTA – Road Traffic Accident
RTC – Road Traffic Collision
SCD – Specialist Crime Directorate
SCG – Serious Crime Group
SO – Specialist Operations
SOCA – Serious and Organised Crime Agency
Sitrep - Situation Report
TC – Traffic Collision
TFU – Tactical Firearms Unit
TOA – Time of Arrival
TWOC – Taking (a vehicle) Without Owner’s Consent
UCO – Under Cover Of
VSS – Victim Support Scheme
Police rankings
AFO –Authorised Firearms Officer
DC – Detective Constable
DS – Detective Sergeant
DI – Detective Inspector
DCI – Detective Chief Inspector
Det Supt – Detective Superintendent
DCS – Detective Chief Superintendent
ACC – Assistant Chief Constable
DCC – Detective Chief Constable
CC – Chief Constable
CSE – Crime Scene Examiner
FI – Forensic Investigator
FLO – Family Liaison Officer
FME – Forensic Medical Examiner
PCSO – Police Community Support Officer
SIO – Senior Investigating Officer
UCO – Undercover Officer
