This flag represents those persons who refuse to remain in the assigned temporal generation. It is a Trans flag of sorts, Trans-Temporal to be exact.
The flag represents a double rainbow as a symbolic portal of crossing through time. If you have ever seen a Double Rainbow in the wild, then you have been invited to be a part the chosen ones for the mystical Trans-Temporal lifestyle.
The canton on the side represents all the organic tones of humanity. Likewise on the white chevron has stars painted in infrared and ultra violet. Thus one needs special goggles or unique biological modifications to see the thirteen stars. There are 15 stripes based upon Isaac Newton's dissection of visible light; red, orange, yellow, green, blue (cyan), indigo (what we consider blue), and violet.
So if you don't fit into your assigned Generation feel free to let these colours fly, time is a human construct after all.