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==Science and technology== * [[df (Unix)]], a Unix command to report disk space usage by a filesystem * [[Dairy]] free, identifying products that contain no milk * [[Decapacitation factor]], in biochemistry * [[Degrees of freedom]], various measures in statistics, mathematics and physics * [[Density function]], a mathematical function with a wide range of applications * [[Dielectric loss]] * [[Direction finding]], a technique used to locate radio transmitters * [[Direction flag]], a flag stored in the FLAGS register on all x86-compatible CPUs * [[Dissipation factor]], a measure of loss-rate of energy of an oscillation mode in a dissipative system * [[Dongfeng (missile)]], a Chinese intercontinental ballistic missile * Dongfeng series of diesel locomotives ** [[China Railways DF]] ** [[China Railways DF4]] ** [[China Railways DF8]] * [[Methylphosphonyl difluoride]], a chemical weapons precursor * [[Daylight factor]] (DF), the ratio of the light level inside a structure to the light level outside the structure.
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