In the literature, I occassionally see something like this:

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The discussion clarifies that the notation "6129270(50) eV" indicates the value of 6129270 eV with an uncertainty of 50 eV in the final digits. This format is commonly used in scientific literature to express precision in measurements. The number in brackets specifically denotes the uncertainty associated with the measurement, which is crucial for accurate data interpretation in fields such as physics and engineering.

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In the literature, I occassionally see something like this: 6129270(50) eV

What does the number in bracket mean?
 
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Generally it gives the uncertainty in the final digits.
 

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