The meaning of the Acronym SDF is...

SDF is

• System Development Facility (Breadboard)
• Software Development Facility
• Single Degree of Freedom
• Safing and Deservicing Facility

More Meanings For SDF:

• Source Definition File
• System Data Format file ( Fixed-length ASCII Text)
• Simple Document Format
• Stuff Done Flag
• Serial Data Field
• Standard Download File
• Software Development File
• Software Development Folder
• Simple Data Format
• Syntax Definition Formalism
• Standard Delay Format
• Super Dimensional Fortress
• Simple Doocument Format
• Statistical Distribution Function
• Self Describing Files

SDF is also in:

• File Extensions
• General
• Networking
• Software
• Unfiled