Working with Duplicates

What is the Score column on the right, which pops up when I request
a list of duplicates in the “Merge Duplicates” utility.
The scores are numbers, appearing to be percentages, for example:

40.14444444444444
39.97
39.69
38.0

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The higher the score, the more likely the two individuals are duplicates. I am not sure how this is calculated internally.

And what a joke these numbers are! Such precision!
40.14444444444444
What a waste of space!