旗 refers to flags and banners. Used both literally and figuratively.
COMMON COMPOUNDS:
- 国旗: national flag
- 白旗: white flag (surrender)
- 旗印: banner, slogan, rallying cry
- 赤旗: red flag
COMMON EXPRESSIONS:
- 旗を振る: to wave a flag
- 旗を揚げる: to raise a flag; to start a cause
- 旗を掲げる: to hoist a banner
- 旗色が悪い: things look bad (idiom)
CULTURAL NOTE:
The Japanese national flag is called 日の丸 (circle of the sun).