DICTIONARY OF AUTOMOTIVE TERMS - "Db"

dB
Acronym for Decibels
dBA
A unit of measure for decibels, the measure of sound intensity or pressure named after Alexander Graham Bell. It is a logarithmic measurement; every 3dB increase represents a doubling of the sound pressure. The A in dBA indicates that the measurement was taken with an A-weighted scale; sound pressure varies across the audible spectrum, and the A-weighted scale approximates the human ear's sensitivity to various frequencies.
DBI
Acronym for De Danske Bilimport rer" (Denmark)
Dbl
Abbreviation for double, as in dbl.-wide rear wheels.