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

People

Places

Science and mathematics

Mathematics

Chemistry

Biology

  • 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

Transportation

Routes

Vehicles

Groups, companies, organizations

Other

  • 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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