The digits that are reported in an answer are called significant figures.
significant digits
Significant Digits.
To determine the number of significant digits in the result of the calculation ((4.3 - 3.7) \times 12.3), we first consider the operations involved. The subtraction (4.3 - 3.7) has two significant digits (because 4.3 and 3.7 each have two decimal places). The multiplication by 12.3, which has three significant digits, will be limited by the result of the subtraction. Therefore, the final answer should be reported with two significant digits.
Certain digits refer to the digits in a numerical value that are known with complete accuracy, as opposed to uncertain or ambiguous digits. In measurements, certain digits include all the digits that can be confidently reported based on the precision of the measuring instrument, plus one estimated digit that reflects the measurement's uncertainty. For example, in the measurement 12.3 cm, the digits '1', '2', and '3' are certain, while the last digit is considered uncertain.
Digits or decimal digits more specifically. The decimal system has 10 unique digits 0-9.
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the number of digits reflects the certainty in the measurement
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Significant Figure.
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significant digits
Significant Digits.
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Magnitude
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