[Q] What are the units in a PCA?

In my case, I generated a PCA among 4 groups of fishes that typically are measured in mm, but I removed the effects of size. The units along each PC increase/decrease by increments of 0.03, but I’m not sure what these units actually are? Thank you SO much in advance!

submitted by /u/Awhalesblowhole
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Nevin Manimala

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