An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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nabla
  نابلا  
nâblâ (#)
Fr.: nabla  

The mathematical symbol for the → del operator.

See also: From Gk. nabla an ancient stringed instrument, triangular in shape and held like a harp, thus of the shape of ∇.