What does dbx stand for?

Decibels Expanded - Initialism is name of electronics company and brand name of its products

design-basis explosion (SAUS)

Davis Brothers Marine, Westport Point, MA - Manufacturer code for watercraft hull identification number (USCG)

Debugger for UNIX (SAUS)

Decibel Above the Reference Coupling (MCD)

Digital Branch Exchange (CIST)

Digital Business Exchange (SAUS)

Direct Branch Exchange (TLAA)

Distributed Branch Exchange (SAUS)

Dive Bombing Exercise (SAUS)