...the Isle of Mann. However, they do have a fascinating flag.
Ah, something I know about!
It's gules, a triskele argent garnished and spurred or. In other words: red, with three fancy silver (armored) legs spiraling out from the center, with gold spurs. It comes from the arms of the King of Mann...which we know of as far back as the late 13th Century because they're one of the last arms shown on the Wijnbergen Armorial Roll.
Useless info...I know.
The red ("gules") isn't a blood red. Blood red is non-standard, but if used, would be blazoned "sanguine".
@Sanguine 
