A4

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A4 and variants may refer to:

Science and mathematics[edit]

Medicine[edit]

  • ATC code A04 Antiemetics and antinauseants, a subgroup of the Anatomical Therapeutic Chemical Classification System
  • Lipoxin A4, a lipoxin

Transportation[edit]

Aeronautics[edit]

Locomotives[edit]

Other vehicles[edit]

Roads[edit]

Railway stations[edit]

Other uses[edit]

See also[edit]