This is the 2558th most frequent Japanese word.
宇
The Japanese word "宇" means "universe" or "eaves."
Here, 宇 (u) is used as part of the compound word 宇宙 (uchuu), meaning 'universe'. '宙' complements it to refer to space and the cosmos.
宇宙は広大で未知の世界が広がっています。
The universe is vast and contains unknown worlds.
In this sentence, 宇 (u) refers to the structure or eaves of a building, showing its architectural significance.
この寺の門は壮大な宇を形作っています。
The gates of this temple form a magnificent arch.
Here, 宇 (u) metaphorically indicates a scope or realm, emphasizing the transcendence of boundaries.