It has no significance at all, it is redundant.
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necessary correction can be made to find the correct measurement
a line
170.040 has six significant figures. A significant figure is any non-zero digit or any embedded or trailing zero. Leading zeros are not significant.
You can read it in decimal as "zero point two five zero". This is equivalent to 0.25 (zero point two five), unless the zero is included intentionally to indicate the accuracy of the measurement. If you happen to remember that 1/4 = 0.25, you can also read this as "a quarter inch" or "one fourth of an inch".
If the measurement was of such precision that the zero to the right of the 3 could be measured with accuracy, then it has two significant digits {30}.