DBM

Stands for "Data Base Management" routines, a set of routines that emulate an "associative array" using disk files. The routines use a dynamic hashing scheme to locate any entry with only two disk accesses. DBM files allow a Perl program to keep a persistent "hash" across multiple invocations. You can tie your hash variables to various DBM implementations--see AnyDBM_File and DB_File.

Abbreviation. dB referenced to one milliwatt. Note 1: dBm is used in communication work as a measure of absolute power values. Zero dBm equals one milliwatt. Note 2: In DOD practice, unweighted measurement is normally understood, applicable to a certain bandwidth, which must be stated or implied. Note 3: In European practice, psophometric weighting may be implied, as indicated by context; equivalent to dBm0p, which is preferred.