Honmon no Honzon': Honmon no Honzon is a Buddha, specifically Sakyamuni in Gaya Jodo (伽耶成道), who has recognized himself as Nyorai throughout the eternal past, which is written in "Juryo-bon" (a part of the sutra).
「本門の本尊」：本門の本尊は、伽耶成道の釈尊が、寿量品でみずから久遠常住の如来であることを開顕された仏。