The meaning of the Acronym SF is...

SF is

• Science Fiction
• Speculative Fiction
• The Sophomore Freshman
• Samuel Freeman

More Meanings For SF:

• Semi Floating
• Store and Forward
• Significant Figures
• Sort Flag
• Suppress Form
• Single Field
• Service Field
• System Field
• IRCAM Sound File
• OS/2 WPS attribute storage
• Sign Flag
• Support Facility
• Standard Font
• Small Format
• Signature File

SF is also in:

• Assembly
• Databases
• File Extensions
• General
• Security