significant figure

/S AH0 G N IH1 F IH0 K AH0 N T F IH0 G Y ER0/
noun
  1. 1

    A digit that is meaningful with respect to the precision of a measurement: in other words a digit that is nonzero, followed by a nonzero digit, or (for trailing zeroes) justified by the precision of the derivation or measurement.

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Source: https://en.wiktionary.org/wiki/significant%20digit, https://en.wiktionary.org/wiki/significant%20figure