What does D4 stand for?

Fourth Generation Channel Bank (48 Voice Channels on 2 T-1s or 1 T-1c)

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Division 3 Male (sports classification) Dual 3 Lane Motorway (UK) D3 Dopamine Receptor Dithiole 3 Thione Dorsal Third Ventricle 4-Sided Die (gaming) Decontamination, Dismantlement, Deactivation, and Decommissioning (US DoE) Degrade, Disrupt, Deny, Destroy Delta4 (work process and performance improvement system for sales organizations) Dillinger Four (band)		MI-5 Special Services Direct Injection 4 Stroke - Diesel (Toyota) 2',3'-Didehydro-2',3'-Dideoxythymidine Monophosphate Dermatology for Animals (Campbell, CA) Design for Business Disciples 4 Christ Designing for Dissemination (US NCI; Bethesda, MD) Devices for Dignity (healthcare technology cooperative; UK) Dogs for Diabetics (Concord, CA) Dollars for Democrats (political group)