Proper noun
Hinomaru
The national flag of Japan, consisting of a large red disc (representing the sun) in the centre of a white rectangular horizontal background.
As for Hinomaru, unlike its counterparts in defeated Axis countries Germany or Italy, it survived and continues to be Japan’s national flag. Source: Internet
Those operating in the Pacific theater acquired a specialized British insignia — a modified blue-white roundel with white "bars" to make it look more like a U.S. than a Japanese Hinomaru insignia to prevent friendly fire incidents. Source: Internet