A valve in which fluid flow is controlled by a ball with a hole drilled through it. In one position, fluid flows through the hole. When the valve is turned 90 degrees (1/4 turn) the hole is perpendicular to the flow and the ball stops the flow. Intermediate valve positions can be used to adjust the flow. 

A hose-coupling device having two male thread nipples for connecting hose and for connecting two female couplings of the same diameter.

Abbreviated (NH) for national hose. Specifically defined screw thread used on fire hose couplings.

Moisture content that a fuel particle will attain if exposed for an infinite period in an environment of specified constant temperature and humidity. When a fuel particle reaches equilibrium moisture content, net exchange of moisture between it and its environment is zero. 

The smoldering zone behind the zone of an advancing fire front.

Entering a structure of vehicle illegally by means or physical force, often characterized by prying doors and breaking windows.

Model legislation recommended by the Fire Marshals' Association of North America and adopted by many states, regulating display of fireworks.

That area on the surface of the earth, runway, or ramp that is covered by the tread of the aircraft tire while the aircraft is motionless.

After felling, cutting branches, tops, and unwanted boles into lengths such that resultant logging debris will lie close to the ground.

Computerized interagency summary of fire suppression qualifications of listed personnel. Available information includes fire training record, fire experience record, and physical fitness testing score for each individual.