title: AR2
text: # AR2
  
  AR2 may refer to:
  
  * AR2 (train), European railbus
  * Arkhangelsky Ar-2, Soviet dive bomber
  * Arkansas's 2nd congressional district
  * Arkansas Highway 2
  * Dorand AR2, a French two-seater aircraft of World War I, also converted to a two-casualty ambulance version
  * $Ar_2,$ the chemical formula for diargon
  