Berean Study Bible (BSB) - Revelation 17:9 >

This calls for a mind with wisdom. The seven heads are seven mountains on which the woman sits.

Textus Receptus (TR) - Revelation 17:9 >

Ὧδε ὁ νοῦς ὁ ἔχων σοφίαν. Αἱ ἑπτὰ κεφαλαὶ ὄρη εἰσὶν ἑπτά, ὅπου ἡ γυνὴ κάθηται ἐπ᾿ αὐτῶν.