Miscellaneous
- Dead Peer Detection, a feature of some IPsec VPN implementations
- Delegated Path Discovery
- Densely packed decimal, a system of binary encoding for decimal digits
- Development Plan Document, documents which outline the key development goals of the Local Development Framework
- Dihydropyrimidine dehydrogenase, an enzyme that is involved in pyrimidine metabolism
- Dissipative particle dynamics, a mesoscopic particle-based materials simulation technique
- Distributed Participatory Design
- Diver propulsion device, an item of diving equipment used to increase range underwater.
- N,N-diethyl-p-phenylenediamine, a Phenylenediamine often used to determine chlorine in water
- Panhispanic dictionary of doubts (Spanish: Diccionario panhispánico de dudas), a Spanish-language dictionary.
- The three letter code for Dorking Deepdene railway station a railway station in Dorking, England.
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