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3H

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English

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Noun

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3H (usually uncountable, plural 3Hs)

  1. (British English) A grade of pencil with lead that makes lighter marks than a pencil grade 2H but darker marks than a pencil of grade 4H; a pencil with hard lead.
  2. A pencil of grade 3H.
  3. tritium. In this case, the "3" should be superscripted: 3H.
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