Full Flight Simulator, an aviation training device.

"For Further Study", a note used in drafts of standards to indicate a section that will need further clarification in next versions. See for example, ITU-T, or the latest 3GPP Vocabulary spec [1]

Facial feminization surgery.

The Berkeley Fast File System, the original name for the Unix File System or UFS.

Formatted File System, a family of database systems developed in the 1960s

Fee-for-service - General industry term

The Sims 2: Family Fun Stuff, a "Stuff Pack" for The Sims 2.

"For fuck's sake" in Internet slang.

For Fucks Sake, the popular novel by Robert Lasner

"Ferrovie Federali Svizzere", the Italian name for the Swiss Federal Railways.

Front des Forces socialistes or the Socialist Forces Front, an Algerian political party.

Farmer Field School, a learning process that has been used by FAO and other organisations to help farmers understand agroecology and apply integrated pest management

"Flash file system", a file system designed for flash memory rather than disks, such as YAFFS or JFFS2.

The Amiga Fast File System, a file system used in AmigaOS.

French Frigate Shoals, an island in the Northwestern Hawaiian Islands.