significant digit

Noun
  1. Any digit of a number that is known with certainty;
    Any digit of a number beginning with the leftmost non-zero digit and ending with the rightmost non-zero digit (or a zero considered to be the exact value) (synset 113764151)
    "he calculated the answer to four significant figures"
    is a type of: digit, figure - one of the elements that collectively form a system of numeration
    same as: significant figure

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