S4, S 4, Š-4, S.4 or S-4 may refer to:

People

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Places

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Science and mathematics

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Mathematics

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Chemistry

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Biology

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  • Fourth heart sound, or S4, an abnormal heart sound often indicative of congestive heart failure or cor pulmonale
  • Fourth sacrum of the vertebral column in human anatomy
  • Sacral spinal nerve 4, a spinal nerve of the sacral segment

Technology

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Transportation

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Routes

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Vehicles

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Groups, companies, organizations

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Other

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  • S4 (classification), a disability swimming classification
  • Form S-4, a form required by the Securities and Exchange Commission to declare mergers and acquisitions
  • S4 standard, a set of standards for model railways (P4 gauge)

See also

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