[1] Software Development Framework/Facility
[2] Seasonal Derating Factor (->"IEEE Standard Dictionary")
[3] Single-Degree-of-Freedom
[4] Standard Data Format (bei Datenbanken)
[5] Service Data Function (in ITU-T Q.1201)
[6] Space Delimeted File/Format
[7] Safing & Deservicing Facility (->"NASA Acronym List")
[8] Louisville-Standiford Field, KY, USA -internationale Fughafen-Kennung