Same-sex marriage

Sault Ste. Marie, Ontario

Sault Ste. Marie, Michigan

Society of the Sacred Mission (SSM)

Soft systems methodology, an approach to organisational process modelling

Shattuck-Saint Mary's, a boarding school in Fairbault, MN.

Standard Solar Model, the best current physical model of the sun

Socialistický svaz mládeže (Socialist Union of Youth), the Czechoslovakian Communist youth organisation

Squadron Sergeant Major, a warrant officer appointment in the British and some Commonwealth armies

System Safety Monitor, a HIPS software or behaviour blocker developed by System Safety Ltd for the Windows platform

SummerSlam, an annual professional wrestling pay-per-view event

Surface-to-surface missile

Source-specific multicast, a method of delivering multicast packets

Staff Sergeant Major, a warrant officer appointment in the British and some Commonwealth armies

Semi-Solid Metal Casting, a process in the production of aluminium or magnesium parts

Federation of Trade Unions of Macedonia

Society for Social Medicine, a British society for researchers in social, community and public health

Special study modules, now known as student selected components, optional elements in the syllabus of UK medical schools

Synchronization Status Message, a message byte used in SONET/SDH systems, and carried in some PDH signals, used to indicate if the signal is usable for timing