What is "PCI" in the ACS geography file?

Anyone know what the PCI flag in the ACS geography file stands for?

It's either "Y" or blank. There are 524 lines in the new ACS (2022 1-year) geo file that have PCI = Y. 

I suspect it designates either principal cities of CBSAs, or geo components of states and larger areas that are within principal cities of CBSAs. Can anyone confirm this?

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