DF
[1] Damage Free[2] Decimal Fraction
[3] Decontamination Factor
[4] Deflection Factor
[5] Deuterium Fluoride
[6] Direction Finder
[7] Disk File
[8] Dissipation Factor
[9] Dose Factor
[10] Double Feeder (->""IEEE" Standard Dictionary")
[11] Disassembly Facility (->""NASA" Acronym List")
[12] Display Funtions (->""NASA" Acronym List")