Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Glossary of Terms

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

- T -

Deploying and directing resources on an incident to accomplish the objectives designated by strategy.

Temporary Flight Restrictions (TFR):
A restriction requested by an agency and put into effect by the Federal Aviation Administration (FAA) in the vicinity of an incident restricting the operation of nonessential aircraft in the airspace around that incident.

A device for throwing a stream of flaming liquid, used to initiate rapid ignition during burn out operations on a wildland fire or during a prescribed fire project.

Test Fire:
A small fire ignited within the planned burn unit to determine the characteristics of the prescribed fire, such as fire behavior, detection, performance, and control measures.

Time needed under specified conditions for a fuel particle to lose about 63 percent of the difference between its initial moisture content and its equilibrium moisture content. If conditions remain unchanged, a fuel will reach 95 percent of its equilibrium moisture content after four timelag periods.

The ignition and flare-up of a tree or small group of trees, usually from bottom to top.

Two-way Radio:
Radio equipment with transmitters on the same frequency as the base station, permitting conversation in two directions using the same frequency in turn.

The capability of a firefighting resource in comparison to another type. Type 1 usually means a greater capability in power, size, or capacity. Can refer to type of engine or type of crew or type of team.