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Pica

A pica is a unit of length commonly used in typography and printing to measure font sizes, line lengths, and spacing. It is equal to 1/6 of an inch, or exactly 12 points in the point system.

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  1 pica = 1/6 inch ≈ 4.233 millimeters

  
  
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  1 pica = 12 points

  
  
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  Used primarily in graphic design, printing, and typesetting

  
  
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  Helps standardize the measurement of fonts, columns, and layouts

  
  

The pica remains a fundamental unit in desktop publishing and print design, helping maintain consistency in text and page formatting.

Fathom

A fathom is a unit of length traditionally used to measure the depth of water. It equals 6 feet or approximately 1.8288 meters.

Originating from the Old English word fæðm, meaning "to embrace" or "outstretched arms," the fathom was based on the average distance between a person's outstretched arms. It has been widely used by sailors and navigators to estimate sea depths and underwater distances.

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  1 fathom = 6 feet

  
  
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  1 fathom ≈ 1.8288 meters

  
  
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  1 fathom = 2 yards

  
  

Though modern sonar and electronic instruments now measure depth more precisely, the fathom remains a traditional unit in nautical contexts, especially in maritime charts and historical references.