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C20

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C20 or C-20 may refer to:

Science and technology

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  • Carbon-20 (C-20 or 20C), an isotope of carbon
  • C20, the smallest possible fullerene (a carbon molecule)
  • C20 (engineering), a mix of concrete that has a compressive strength of 20 newtons per square millimeter
  • Malignant neoplasm of rectum, a type of colorectal cancer (ICD-10 code: C20)
  • Caldwell 20 or North America Nebula, an emission nebula in the constellation Cygnus
  • IEC 60320 C20, a polarised, three pole socket electrical connector
  • C20 (Capacity, 20 hours), C100 (100 hours), battery capacity

Transportation and military

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Other uses

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