宇
eaves, roof, house, heaven
On'yomi: ウ (u)
Stroke order
宙
mid-air, air, space, sky, memorization, interval of time
On'yomi: チュウ (chuu)
Stroke order
機
loom, mechanism, machine, airplane, opportunity, potency, efficacy, occasion
On'yomi: キ (ki)
Kun'yomi: はた (hata)
Stroke order