significant digits

基本解釋

The function that allows the elimination in the result of the calculation of all digits beyond the least significant digit.
允許消去答數(shù)中最低有效數(shù)字位以下的全部數(shù)字位的功能。
If the first non-significant digit is 5, and all subsequent digits are 0, the last significant digit is rounded to the nearest even digit. See the example that follows.
如果第一個要舍入的數(shù)是5，后面其他的位都是0，那么這個數(shù)就會被舍入到最近的偶數(shù)。
Another advantage is that you can use format specifiers other than %s, so that, for example, you can control how many significant digits the string form of a floating-point number should display.
另一個好處是你能使用不同于%s的格式化標識符，例如，以便于你能控制更多的重要的數(shù)字怎樣顯示浮點數(shù)字的字符串格式。

Two significant digits is good enough.
個有效數(shù)應(yīng)該綽綽有余了。
麻省理工公開課 - 固態(tài)化學(xué)導(dǎo)論課程節(jié)選

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the figures of a number that express a magnitude to a specified degree of accuracy, rounding up or down the final figure