D-SOFT stands for D-Shaped Optical Fiber Transmission
D-SNR stands for Distortion with Signal-To-Noise Ratio (curve)
D-SMES stands for Distributed Superconductor Magnetic Energy Storage
D-SLR stands for Digital Single Lens Reflex (cameras)
D-SIDE stands for Defense Strategic Integrated Decision Environment (US DoD)
D-SIC stands for Degeneracy-Dependent Self-Interaction Correction
D-SHARP stands for Display System using High-Aspect-Ratio Projection (Microsoft)
D-SACK stands for Duplicate Selective Acknowledgment
D-S stands for Direct Synthesis
D-RMA stands for Dynamic Reservation Multiple Access (usually seen as DRMA)