S4 or S-4 may be:
S4 (military), a logistics officer within
military units.S4, a sustainability trends in fashion newsletter created by model
Summer Rayne Oakes and found at
S4trends.comS4 algebra, a variety of
modal logic, also called
Interior algebraS4 inc., Burlington, Massachusetts, top secret facility clearance mission-critical support services to customers like the Department of Homeland Security and U.S. Air Force
[1]S4 safety phrase, see
List of S-phrasesS4 prediastolic
Gallop rhythm, an abnormal
heart sound often indicative of
congestive heart failure or
cor pulmonaleAdvanced Configuration and Power Interface (ACPI), S4 can refer to a sleeping state
Audi S4SATA International (S4
IATA airline designator)
Students for saving social securityVersion 4 of
S (programming language)Fourth
sacral vertebra of the
vertebral column, in
human anatomyS4 In model railways, a highly accurate 4mm/1 ft modelling formatSector Four An aircraft hangar next to
Area 51, said to contain nine UFOs
S4 (Munich) S-Bahn line in Munich
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