• Rx, the symbol used to describe apparent retrograde motion of planets
• rx, an abbreviation for a chemical reaction
  Chemical reaction
  A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions can be either spontaneous, requiring no input of energy, or non-spontaneous, typically following the input of some type of energy, such as heat, light or electricity...
  
  
• Rx, IATA code for Aviaexpress
  Aviaexpress
  - Code data :*IATA Code: RX*ICAO Code: AEH *Callsign: Avex...
  
  , a Hungarian airline

Aeronautica

• Rocket eXperimental
  National Institute of Aeronautics and Space
  National Institute of Aeronautics and Space is the Indonesian government space agency. It was established on November 27, 1964 by former Indonesian president Suharto after one year's existence of an informal space agency organization. LAPAN is responsible for long-term civilian and military...
  
  , an Indonesian Rocket Experimental

Computing and electronics

• Rx meters, a term used in electrical engineering
• Rx bridge, a device for measuring the efficiency of antenna system
• rx, the RPC mechanism used by the Andrew File System
  Andrew file system
  The Andrew File System is a distributed networked file system which uses a set of trusted servers to present a homogeneous, location-transparent file name space to all the client workstations. It was developed by Carnegie Mellon University as part of the Andrew Project. It is named after Andrew...
  
  
• The Renesas Electronics
  Renesas Electronics
  is a Japanese semiconductor manufacturer. It is based in Tokyo and has manufacturing, design and sales operations in around 20 countries. Renesas is one of the world's largest manufacturers of semiconductor systems for mobile phones and automotive applications. It is the world's largest...
  
   RX microcontroller family

Entertainment and arts

• Rx (band)
  Rx (band)
  ℞ or Rx was a one-off side project by Skinny Puppy band member Nivek Ogre, in collaboration with Invisible Records founder Martin Atkins. The project was originally called Ritalin, but the name was changed for legal reasons....
  
  , an industrial band formed by Nivek Ogre and Martin Atkins
• Rx (film), a 2005 film about drug trafficking or Rx, a novel by Elizabeth J. Braswell published under the pseudonym Tracy Lynn

Vehicles

• Lexus RX
  Lexus RX
  The Lexus RX is a crossover sport utility vehicle sold since 1998 by Lexus, the luxury division of the Japanese automobile manufacturer Toyota. Three generations of the Lexus RX have been produced to date, the first being compact in size, and the latter two classified as mid-size...
  
  , a 1997 luxury crossover SUV
• Mazda RX, a series of sport cars
• RX, an abbreviation for rallycross
  Rallycross
  Rallycross is a form of sprint style automobile racing, held on a closed mixed-surface racing circuit, with modified production or specially built road cars, similar to the World Rally Cars, although usually with about stronger engines, due to e.g. their 45 mm turbo restrictor plates. It is...
  
  
• RX, the registration code for fishing boats registered in Rye, East Sussex
  Rye, East Sussex
  Rye is a small town in East Sussex, England, which stands approximately two miles from the open sea and is at the confluence of three rivers: the Rother, the Tillingham and the Brede...
  
  , used by the Rye and Hastings fishing fleets