In the context of wildland fire, a prescription is measurable criteria that define conditions under which a prescribed fire may be ignited. Prescriptions may also be used to guide selection of management responses to wildfire to define conditions under which management actions are most likely to achieve incident management objectives. Prescription criteria typically describe environmental conditions such as temperature, humidity and fuel moisture, but may also include safety, economic, public health, geographic, administrative, social, or legal considerations. 

Water or fire retardant projected directly from the nozzle (as contrasted with a fog or spray cone), provided by a solid stream orifice or by adjusting a fog jet into a straight stream pattern.

System of radio navigation in which any magnetic bearing relative to a special radio transmitter on the ground may be chosen and flown by an aircraft pilot.

Two or more separate points of fire origins at a fire scene; strong indication of arson.

System for airplane landing in which the pilot is guided by radio beams.

Light given off by burning gasses during the combustion process.

Burnable organic material (duff, peat, rotten wood, etc.) with a high surface to volume ratio.

Removing branches from a felled or standing tree, or from brush.

A rotary wing aircraft configured, staffed and equipped to respond, care for and transport a patient(s) and approved/licensed by a state to do so. An air ambulance is sometimes referred to as a medevac.

A ground transport vehicle configured, equipped and staffed to respond, care for and transport a patient(s) and approved by a state to do.