- Eastern European coat of arms
- (UK, Australia, New Zealand, military) Special Air Service; an elite unit of the British army. Similar units operate in the Australian and New Zealand armies.
- (Scandinavia) Scandinavian Airlines System; a joint Swedish, Norwegian and Danish airline company.
- (computing) Serially Attached SCSI, a computer bus standard for mainly connecting hard drives, but also used for other devices, derived from the SCSI and SATA standards.