宇
ウ, いえ, たか, ひろ, ひろし
eaves, roof, house, heaven
JLPT2 G6 S6 F883
As per
于
# (U-shaped) +
宀
roof/building → large, curving roof/eaves → *the heavens/universe*. Compare
宙
.
[Full Kanji Etymology List]