Columbia Records introduces the 33 1/3 LP (“long playing”) record at New York's Waldorf-Astoria Hotel[?], featuring 25 minutes of music per side, compared to the four minutes per side of the 78 rpm record, the previous standard.
... can mean the following:
dB is the abbreviation for Decibel; see Bel
DB is a French automobile maker; see DB (car)
DB is the abbreviation for Deutsche Bahn, ...