FECanon
From FEInfobase
Items marked with this image have been declared FECanon by the Futility's End Commanding Officer, this is most often used to denote items of fiction that are considered canon events within Futility's End.
In the wider world of Futility's End canon is maintained by the Quad, each member of the Quad is responsible for ensuring plot lines undertaken within Futility's End do not destroy or disturb the FE Universe.
If you have any ideas you would like to see implemented in Futility's End, or if you have a plot that is going to impact on more than just your character please discuss the idea with a member of the Quad, doing this before you start is better than getting all the way in to a plot and finding that your destroying 5 years of back story.