Where does “𐽰𐽳𐽶𐽰” come from?

𐽰𐽳𐽶𐽰 (Old Uyghur) comes from Proto-Turkic uya, from Middle Chinese 窩.

𐽰𐽳𐽶𐽰 (Old Uyghur): nest, lair, shelter, den