What was the last digit DNA for?

I am about to finish this course (finally) but Filip did not mention what the last digit for the DNA was for.
The name is dnaspecial or lastnum.
In the “Our DNA - Introduction” video, he said that he’s going to explain the the last digit sometime later in the course.

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hey @REGO350. Last digit is for you to add a custom attribute. Or some special trait.