1. rating system a system of classifying according to quality or merit or amount
  2. writing system a method of representing the sounds of a language by written or printed symbols
  3. heating system utility to warm a building
  4. voting system a legal system for making democratic choices
  5. coding system a system of signals used to represent letters or numbers in transmitting messages
  6. operating system (computer science) software that controls the execution of computer programs and may provide various services
  7. drainage system a system of watercourses or drains for carrying off excess water
  8. pricing system a system for setting prices on goods or services
  9. filing system a system of classifying into files
  10. patent system a legal system for protecting the rights of inventors
  11. recording system audio system for recoding sound
  12. cooling system a mechanism for keeping something cool
  13. receiving system set that receives radio or tv signals
  14. steering system a mechanism by which something is steered
  15. banking system banks collectively
  16. lubricating system mechanical system of lubricating internal combustion engines in which a pump forces oil into the engine bearings
  17. metric system a decimal system of weights and measures based on the meter
  18. tone system the system of tones used in a particular language or dialect of a tone language
  19. 12-tone system a type of serial music introduced by Arnold Schoenberg
  20. tonal system the system of tones used in a particular language or dialect of a tone language

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