Acronym for electromagnetic radiation hazards.

A unit of plane angle measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.
Note: One radian is equal to 360°/2, which is approximately 57° 17'
4
4. 6".

Radiant power, in a given direction, per unit solid angle per unit of projected area of the source, as viewed from the given direction.
Note: Radiance is usually expressed in watts per steradian per square meter.

Radiant power emitted into a full sphere, i.e., 4 sr (steradians), by a unit area of a source, expressed in watts per square meter. Synonym radiant exitance.

Energy in the form of electromagnetic waves.
Note 1: Radiant energy may be calculated by integrating radiant power with respect to time.
Note 2: Radiant energy is usually expressed in joules.

Synonym radiant emittance.

Deprecated synonym for radiant power.

Radiant power per unit solid angle, usually expressed in watts per steradian.

The rate of flow of electromagnetic energy, i.e., radiant energy.
Note 1: Radiant power is usually expressed in watts, i.e., joules per second.
Note 2: The modifier is often dropped and "power" is used to mean "radiant power". Deprecated synonyms flux, radiant flux.

1. In communication, the emission of energy in the form of electromagnetic waves.
2. The outward flow of energy from any source in the form of radio waves. [NTIA] [RR]