significant figure
noun/ˌsɪɡnɪfɪkənt ˈfɪɡə(r)/
/ˌsɪɡnɪfɪkənt ˈfɪɡjər/
(mathematics)- each of the digits in a number that are needed in order to give it accurately
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significant figure
Definition of significant figure noun from the Oxford Advanced Learner's Dictionary