dBrn

The symbol dBrn or dB(rn) is an abbreviation for decibels above reference noise.

Weighted noise power in dB is referred to 1.0 picowatt. Thus, 0 dBrn = -90 dBm. Use of 144 line, 144-receiver, or C-message weighting, or flat weighting, can be indicated in parentheses.