Glossary

== A ==
=== Actual Bodily Harm (ABH) ===
Anything interfering with the health or comfort of victim, which is more than merely transient or trifling has been held by Australian courts to be "actual bodily harm".
=== Angel of Mercy ===
An angel of mercy or angel of death is a rare type of criminal offender (often a type of serial killer) who is usually employed as a caregiver and intentionally harms or kills people under their care. The angel of mercy is often in a position of power and may decide the victim would be better off if they no longer suffered from whatever severe illness is plaguing them. This person then uses their knowledge to kill the victim. In some cases, as time goes on, this behaviour escalates to encapsulate the healthy and easily treated.
== B ==
=== Black Widow ===
The black widow serial killer is a woman who murders three or more husbands or lovers for financial or material gain over the course of her criminal career.
== G ==
=== Grievous Bodily Harm (GBH) ===
Any bodily injury of such a nature as to endanger, or be likely to endanger life, or cause or be likely to cause permanent injury to health.
== M ==
=== Modus Operandi ===
A modus operandi (often shortened to M.O.) is someone's habits of working, particularly in the context of a business or criminal investigations, but also more generally. It is a Latin phrase, approximately translated as method or mode of operation.
== S ==
=== Signature ===
A signature is an aspect (or aspects) of a crime that is completely unique to the perpetrator(s) and commonly not shared by any other.
=== SIO ===
Senior Investigating Officer. Usually, an inspector managing the overall operation of a case. Also can refer to the senior officer within the case.
== V ==
=== Viper ===
Viper is the WA Police Major Crime Investigation case management system.
=== VLO ===
Victim Liaison Officer. This officer has received training in dealing with the specific needs of a victim of a serious crime, or in the case of a homicide, the family of the victim.