Security Glossary - H

This glossary has been created to assist security professionals in defining security terms commonly used by the profession and the industry, worldwide. It is a developing list that will be maintained, and where appropriate, modified, and changed over time. Terms borrowed from related fields, such as engineering, investigations, safety, etc. will be included when deemed necessary for the security professional.


The definition's source is cited in brackets [ ] following the definition. View the key to all cited reference sources.

It is NOT our goal to publish this glossary in print since it is intended to be a current online reference (on the ASIS website) to serve the security professional on an ongoing basis.

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

(1) ​Possible source of danger, or conditions (physical or operational) that have a capacity to produce a particular type of adverse effect(s).
[ASIS SPC.1-2009]  [ANSI/ASIS PAP.1-2012]
(2) Source of potential harm.
Note: Hazard can be a risk source.

hearsay evidence

​Testimony from a person who has secondhand knowledge.
[ANSI/ASIS INV.1-2015]

homeland security

​The federal government’s efforts -- in coordination with state and local governments and the private sector -- to develop, coordinate, fund and implement the programs and policies necessary to detect, prepare for, prevent, protect against, respond to, and recover from terrorist or other attacks within the United States.

human capital

​Includes organization staff (leadership, directors, managers, and employees), customers, and any others the organization has a duty to protect.
[ASIS CSO.1-2008] [ANSI/ASIS CSO.1-2013]

human rights

​Integrity of persons and their rights and fundamental freedoms under international and national law and consistent with the principles of the International Code of Conduct for Private Security Service Providers (ICoC), as well as relevant International Maritime Organization (IMO) Circulars.
[ANSI/ASIS PSC.4-2013]


​Heating, ventilating, and air-conditioning system.
[ASIS GDL TASR 04 2008]