house flag

Short definition from Wiktionary

Noun

1. 1
   Alternative form of house-flag: Flag that identifies a shipowner.
2. 2
   Alternative form of house-flag: Flag that identifies a company, unit, or group.
3. 3
   A flag flown at a house.
4. 4
   A flag that uniquely identifies the company that owns or, occasionally, that operates a ship.
5. 5
   A flag that identifies a company, unit, or other group.