What does SF stand for?

What does SF mean?

SF	Surcharge Free Business » Accounting
SF	Structural Funds Business » Accounting
SF	Square Footage Academic & Science » Architecture
SF	Step Footing Academic & Science » Architecture
SF	Semi Floating Computing » Assembly
SF	Store and Forward Computing » Assembly
SF	Significant Figures Computing » Assembly
SF	Sort Flag Computing » Assembly
SF	Suppress Form Computing » Assembly
SF	Surface Features Academic & Science » Astronomy
SF	Science Fiction Academic & Science » Astronomy
SF	Self-Flocculating Academic & Science » Botany
SF	Spreading factor Academic & Science » Botany
SF	Supremely Frustrating Internet » Chat
SF	Silly Female Internet » Chat
SF	Sexy Female Internet » Chat
SF	Soft Feel Miscellaneous » Clothes
SF	Silver Fallow Miscellaneous » Colors
SF	Social Functioning Community
SF	San Francisco Community
SF	Suomi Finland Regional » Countries
SF	Schweizer Franken (Swiss Franc) Regional » Currencies
SF	Single Field Computing » Databases
SF	Service Field Computing » Databases
SF	System Field Computing » Databases