significant figure
US /ˌsɪɡˈnɪf.ɪ.kənt ˈfɪɡ.ər/
UK /ˌsɪɡˈnɪf.ɪ.kənt ˈfɪɡ.ər/

1.
cifra significativa, cifre significative
a digit in a number that is not a leading or trailing zero, or a zero that is not a placeholder
:
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The measurement 0.0050 has two significant figures.
La misura 0.0050 ha due cifre significative.
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When performing calculations, always consider the number of significant figures.
Quando si eseguono calcoli, considerare sempre il numero di cifre significative.