Fin flash
![Low-visibility Royal Air Force fin flash on the fin of an Avro Vulcan above the aircraft serial](/Images/godic/202501/13/UKMilitarySerial-XM6074949.jpg")
![](/Images/godic/202501/13/RAF-Finflash-Noncombat.svg4949.png")
![](/Images/godic/202501/13/Fin_flash_of_Benin.svg4949.png")
![](/Images/godic/202501/13/Brazilian_Naval_fin_flash.svg4949.png")
A fin flash is part of the national markings of the military aircraft of a number of countries.
In addition to the insignia displayed on the wings and fuselage, usually in the form of roundels, an additional marking known as a fin flash may also be displayed on the fin or rudder.