What is a "power law index"

My son, studying at Plymouth University asked me today thinking I might know from my boat building days.

That was a while back, I have been a marine artist for almost 30 years.

How should I know???
I thought the idea of Uni was to learn things parents don’t know, or have I missed some thing here?

Do you have any info or any thoughts on what is a Power Law Index?

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