Any piece of (fire) equipment having a full complement of personnel.

A temporary fireline constructed at right angles to the control line and used to hold a backfire in check as a means of regulating the heat or intensity of the backfire.

An ignition device suspended under a helicopter, capable of dispensing ignited fuel to the ground for assistance in burning out or backfiring.

NWCG standards establish common practices that enable efficient and coordinated national interagency wildland fire operations. These standards may be comprised of requirements, guidelines, procedures, processes, best practices, specifications, techniques, and methods. NWCG standards are interagency by design; however, the decision to adopt and utilize them is made independently by the individual member agencies and communicated through their respective directives systems.

For ground observation purposes, a change of at least 45 degrees in the direction of a significant wind, which occurs in a relatively short time frame.

Acceptance of information as true without proof or demonstration.

Reduction of fire hazard in rough, usually by prescribed burning.

Combustion of a thermally isolated material initiated by an internal chemical or biological reaction producing enough heat to cause ignition.

Rapid combustion and/or explosion of unburned gases trapped at some distance from the main fire front. Usually occurs only in poorly ventilated topography.

A number used to indicate relative (not actual) rate of spread.