What is Negative Zero?

[Brady]

First time posting a question here. I read through the article on the round function https://www.excelguru.ca/blog/2014/09/17/power-query-the-round-function/
So, I began adding RoundingMode.AwayFromZero to all my formulas.

I have a formula which is calculating the volume of some lumber on sales orders.
=Number.Round([Thickness]*[Width]*[Length]/12*Number.Abs([Pieces]),0,RoundingMode.AwayFromZero)

Thickness, Width and Length are always positive numbers, however the # of Pieces can sometimes be negative if it's a credit order. I want the volume to always be positive, so I put the absolute function around the number of pieces.
This works as intended, except when the number of pieces is zero the result is -0
Even if I put the Absolute function around the outside instead of inside, the results also -0
=Number.Abs(Number.Round([Thickness]*[Width]*[Length]/12*[Pieces],0,RoundingMode.AwayFromZero))

This then causes issues with an "IF" formula in Excel afterwards.... =IF(ThisResult=0,"Flag","NoFlag") -- because the result is -0 and not 0, it gives me "NoFlag"

What am I doing incorrectly?