Jisho

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Noun
1. merchant flag
Wikipedia definition
2. Civil ensignThe civil ensign (also known as merchant flag or merchant ensign) is the national flag flown by civil ships (merchant ships and others, as opposed to military) to denote nationality. Countries may have a national flag for most purposes on land, a distinct civil ensign for non-military ships, and a naval ensign for the navy; sometimes two or all of these flags are identical.
Read “Civil ensign” on English Wikipedia
Read “商船旗” on Japanese Wikipedia
Read “Civil ensign” on DBpedia

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