Female Oral Stimulation 'pleasuring the vagina or clitoris with the mouth or tongue'

Factor of safety in mechanical and structural engineering.

The product of the immediate early gene c-Fos which dimerises via a leucine zipper with jun to form the transcription factor activator protein-1

as an initialism for Fructooligosaccharide, an oligosaccharide used as an artificial or alternative sweetener

Feature-oriented scanning

Fos-sur-Mer, Bouches-du-Rhône

FOS/NT - flight operations software from CTA

Fos, Haute-Garonne

Faint Object Spectrograph as done by the Hubble Space Telescope.

Fabric OS, Brocade Fibre Channel operating system (computing)

Fos, a single released by Elena Paparizou