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.dat, computer filename extension, typically for a file considered to contain data •
dat (software), a decentralized data tool for distributing data small and large. •
DAT Solutions, or
Dial-A-Truck, provider of electronic transportation information •
Digital Audio Tape, an audio recording and playback medium •
Double acting tanker, a type of icebreaking tanker ship •
Dynamic Acceleration Technology, increases single-threaded performance on multi-core processors • Dynamic Address Translation, IBM's term for virtual memory mapping: Virtual memory#History ==Transport==