An Ensign

1. A badge of office, rank, or power. https://en.wikipedia.org/wiki/Ensign_(rank)
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. Synonym: ancient
4. (nautical) The principal flag or banner flown by a ship (usually at the stern) to indicate nationality.
5. Any prominent flag or banner.
6. (historical) A junior commissioned officer in the 18th and 19th centuries whose duty was to carry the unit's ensign.

Synonyms

• See badge

(junior commissioned officer):

• coronet (cavalry equivalent of the infantry ensign)
• second lieutenant (OF-1), first NATO commissioned officer grade above OF-0 trainee officer