The right hand represents the Yahweh's power and control. Alternate translation: "This is the root that you, Yahweh, planted" (See: [[rc://en/ta/man/jit/figs-metonymy]])
The word "son" here is probably a metaphor for the "shoots" of ([Psalms 80:11](../080/011.md)). Alternate translation: "the shoot you have caused to grow for your pleasure" (See: [[rc://en/ta/man/jit/figs-metaphor]])