Salesforce: What is RecordType.DeveloperName named in the filter of a page layout? 

What is RecordType.DeveloperName named in the filter of a page layout?
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(salesforce.stackexchange.com/users/16540/sander-de-jong)Sander de Jong
(salesforce.stackexchange.com/users/133505/tushar-jadav)Tushar Jadav
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filters page-layout record-type