Where does “𐽼𐽰𐽲𐽶𐽾” come from?

𐽼𐽰𐽲𐽶𐽾 (Old Uyghur) comes from Proto-Turkic *bakïr — copper (metal).

𐽼𐽰𐽲𐽶𐽾 (Old Uyghur): liver; flank, side