Glossary
| Name | Acronym | Description |
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| Talk group | A group of users communicating over one or more radio channels. |
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| Technical rescue team | A team of personnel who employ specialist rescue tools and skills, with disciplines including rope rescue, swift water rescue, confined space rescue, cave rescue, trench or excavation rescue, and building collapse rescue. |
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| Telemetry | The use of radio signals to transmit live and relevant data between a remote monitoring point and equipment, such as breathing apparatus (BA). |
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| Thermal bowing | During a fire, heat can affect one side of a wall or floor causing thermal bowing resulting from the differential thermal expansion. |
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| Thermal shock | Occurs when a material undergoing sudden changes in temperature develops internal stresses and strains that may cause cracking and eventually failure. |
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| Topography | The physical appearance of the natural features of an area of land, especially the shape of its surface. |
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| Tourniquet | A device for stopping the flow of blood through a vein or artery, typically by compressing a limb. If medical tourniquets are not available, bandages or other items can be used as an improvised tourniquet. |
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| Trachea | Also known as the windpipe, this is the tube that carries air from the throat to the lungs. |
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| Traction current | The electric power supply for rail vehicles, either delivered via rails or overhead line equipment. |
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| Trigger point | A predesignated point in time, place or change in conditions, when tactics may need to be changed. Can also refer to a particular circumstance which causes an event. |
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| UK Health Security Agency | UKHSA | Responsible for protecting every member of every community from the impact of infectious diseases, chemical, biological, radiological and nuclear incidents and other health threats. |
| Under air | When a person is breathing the air from the tank of their breathing apparatus (BA). This can also be referred to as ‘on air’ or ‘using air’. |
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| Unmetalled | Referring to roads that have not been surfaced with a hard material such as metal, asphalt, or concrete. They are usually made of earth, gravel, or sand. |
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| Upper explosive limit | UEL | After this concentration of a gas is exceeded, the gas too rich to burn and is non explosive. |
| Upstream | In relation to moving water, the opposite direction from that in which a stream or river flows, nearer to the source. In relation to the oil, gas, refining and petrochemical industries, upstream relates to obtaining crude oil and gas from natural resources. |
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| Vacuum mattress | A medical device used to immobilise patients, especially those with suspected vertebra, pelvis or limb trauma. |
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| Veterinary organisations | This includes:
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| Water bottoming | Technique for managing a leak using water in a container of a substance with lower density than water, to displace the substance above the point of the leak. | |
| Watercourse | Any natural or artificial channel above or below ground through which water may flow, such as a river, brook, beck, ditch, millstream or culvert. |
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| Wayfinder | A sign, landmark, or other indicator used to assist people in navigating to a particular location. It can also refer to a person providing directions. |
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| Weir | A low dam built across a river to raise the level of water upstream or regulate its flow. |
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| Work positioning | This allows a user to work with both hands free by using appropriate equipment and must include full fall arrest equipment. |
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| Work restraint | This stops the user from falling in the first place, by preventing the user from getting into a position where they can fall. |
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| Zoonoses | Diseases of animals communicable to humans |
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| Zoonosis | A disease of animals communicable to humans |