Transportation

• Reefer ship, a refrigerated ship
• Refrigerator car
  Refrigerator car
  A refrigerator car is a refrigerated boxcar , a piece of railroad rolling stock designed to carry perishable freight at specific temperatures. Refrigerator cars differ from simple insulated boxcars and ventilated boxcars , neither of which are fitted with cooling apparatus...
  
  , a refrigerated railroad boxcar (US practice)
• Refrigerated van
  Refrigerated van
  A refrigerated van is a railway goods wagon with cooling equipment. Today they are designated by the International Union of Railways as Class I.-History:...
  
  , a refrigerated railway wagon (European practice)
• Refrigerated container, used for intermodal cargo
• Refrigerator truck
  Refrigerator truck
  A refrigerator truck is a van or truck designed to carry perishable freight at specific temperatures. Like refrigerator cars, refrigerated trucks differ from simple insulated and ventilated vans , neither of which are fitted with cooling apparatus...
  
  , a temperature-controlled van, truck or semi-trailer

Other

• A slang term for cannabis
  Cannabis (drug)
  Cannabis, also known as marijuana among many other names, refers to any number of preparations of the Cannabis plant intended for use as a psychoactive drug or for medicinal purposes. The English term marijuana comes from the Mexican Spanish word marihuana...
  
  
• Reefer jacket, a type of jacket for midshipmen reefing sails
• Reefer, a midshipman engaged in sail reefing
  Reefing
  Reefing is a sailing manoeuvre intended to reduce the area of a sail on a sailboat or sailing ship, which can improve the ship's stability and reduce the risk of capsizing, broaching, or damaging sails or boat hardware in a strong wind...
  
  
• Reefer, an aquarium hobbyist who keeps corals, sea anemones, and other invertebrates associated with coral reef
  Reef
  In nautical terminology, a reef is a rock, sandbar, or other feature lying beneath the surface of the water ....
  
  s