APPENDIX A
Decibel Units of Measure

These are the most typically used decibel suffixes and other loudness units in audio engineering:

dB Decibels A weighting, which usually refers to dBSPL A weighting, although it could mean dBFS A weighting; it requires another modifier for specific descriptions (e.g., dBSPL A).

dBB Decibels B weighting, which usually refers to dBSPL B weighting, although it could mean dBFS B weighting; it requires another modifier for specific descriptions (e.g., dBSPL B).

dBC Decibels C weighting, which usually refers to dBSPL C weighting, although it could mean dBFS C weighting; it requires another modifier for specific descriptions (e.g. dBSPL C).

dBFS Decibels relating to full scale, a description of signal intensity in the digital domain.

dBRMS Decibels root mean square, the average decibel level; for specific descriptions, it requires another modifier (e.g., dBSPL RMS).

dBSPL Decibels sound-pressure level, a description of loudness in the real world.

dBTP Decibels true peak.

LKFS Loudness, K-weighted, relative to full scale.

LU Loudness units.

LUFS Loudness units relative to full scale.