Answer:
the total radiant heat power
Step-by-step explanation:
The Stefan-Boltzmann law states that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature.

where E is the power from a unit area, T is the absolute temperature and the Greek letter sigma (σ) representing the constant of proportionality, called the Stefan-Boltzmann constant. In SI units, this constant has the value
.
The law applies only to blackbodies, theoretical surfaces that absorb all incident heat radiation.