Yaphah (H3302) means to be beautiful, fair, or radiant. As an adjective it commonly describes physical beauty in narrative. As a verb it conveys the state of being lovely or shining. It appears 42 times in the OT, with concentrated usage in Song of Solomon.
Beauty in the Hebrew worldview carries moral and spiritual overtones — it is not merely aesthetic. Song of Solomon uses yaphah extensively to celebrate the beauty of the beloved as a picture of God's delight in His people. When applied to Zion (Ps 48:2), it points to the glory of God's dwelling place. True beauty is ultimately a reflection of divine glory. Yet Ezekiel warns that beauty can become a source of pride (Ezek 16:15) — the gift usurping the Giver.
Yaphah is the root behind the name Japheth (Gen 9:27 — 'May God extend Japheth's territory'). The word occurs abundantly in Song of Solomon, Proverbs, and the prophets. Its Greek parallel is kalos (G2570) — beautiful, good. Hebrew thought tied outer beauty to inner reflection of divine order.