ensign

1. A badge of office, rank, or power.
2. The lowest grade of commissioned officer in the United States Navy, junior to a lieutenant junior grade.
3. A flag or banner carried by military units; a standard or color/colour.
4. The principal flag or banner flown by a ship (usually at the stern) to indicate nationality.
5. Any prominent flag or banner.
6. A junior commissioned officer in the 18th and 19th centuries whose duty was to carry the unit's ensign.

الجمع ensigns