ensign ensign /ˈɛnsən/

noun

1. Colors flown by a ship to show its nationality  ( ensign )
   colors flown by a ship to show its nationality
    The ship raised its ensign to display its nationality.
   The ship raised its ensign to display its nationality.
   
   
2. An emblem flown as a symbol of nationality  ( ensign , national flag )
   an emblem flown as a symbol of nationality
   
   
3. (military) a person who holds a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant junior grade  ( ensign )
   (military) a person who holds a commissioned rank in the United States Navy or the United States Coast Guard; below lieutenant junior grade