D is a Japanese visual kei hard rock band formed in 2003 by Asagi, Ruiza and Sin, after their previous band Syndrome disbanded.

IEEE D band is the range of radio frequencies from 110 GHz to 170 GHz in the electromagnetic spectrum. This is equal to wave lengths between 1.8 mm and 2.7 mm. The D band is in the  EHF range of the radio spectrum.

D+ is an indie rock band based in Anacortes, Washington. Formed in 1996 by singer/guitarist Bret Lunsford and singers/multi-instrumentalists Karl Blau and Phil Elverum, the band is perhaps best known for Lunsford's droll vocals and witty wordplay, and a minimalist, charmingly ramshackle sound.