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SigFigs
Precision-controlled rounding.
Significant figures count all the meaningfully precise digits in a number, starting from the first non-zero digit — 12300 to 3 sig figs is 12300 (with the 300 approximate), while 0.0123 to 3 sig figs keeps all three non-zero digits shown.
Reporting a measurement with more significant figures than your instrument can actually justify implies false precision — sig figs are how scientific results communicate their real level of confidence.
Rounded to sig figs
12,300
What you entered
Determine the decimal position to round at
3 sig figs at magnitude 10^5= round at 10^2Round to that position
round(12345.6789)= 12300Result
Rounded to sig figs: 12,300
12345.6789 rounded to 3 significant figures is 12300.