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YM, Ym, or ym may refer to:

Arts and entertaimemnt:

Businesses and organizations:

Science and technology:

  • .ym, the Atari ST/Amstrad CPC YM2149 sound chip format
  • YM (selective medium), a selective growth medium which is a combination of yeast and mold
  • Yoctometre (ym), a unit of length or distance
  • Yottametre (Ym), a unit of length or distance

Other uses: