Braille Letter F Flag - Foxtrot

Since indigo (dark blue) is the 6th colour of the rainbow and F is the 6th letter of the alphabet, the Braille Letter F flag is indigo (dark blue).  The assigned contrast indicator for indigo is white, which is why white is included.

Braille Letter E Flag - Echo

Since E is the 5th letter of the alphabet and blue is the 5th colour of the rainbow, the Braille Letter E Flag is blue.  Red is included since it is the assigned contrast indicator for azure-blue.

Braille Letter D Flag - Delta

Since green is the 4th colour of the rainbow and D is the 4th letter of the alphabet, the Braille Letter D Flag is mostly green.  Yellow is included since it is the assigned contrast indicator for green.

Braille Letter C Flag - Charlie

Since yellow is the third colour of the rainbow and C is the third letter of the alphabet we have letter C Braille Flag.  Blue is included as it is the assigned contrast indicator for Braille.

Braille Letter B Flag - Beta

The Braille Letter B Flag is mostly orange since orange is the second colour of the rainbow.  Black is the assigned contrast indicator. 

Braille Letter A Flag - Alpha

The Braille letter A-Alpha flag uses the first colour of the rainbow, since A is first and red is the first visible colour.  The single dot represents the 1st position of the feels that any Braille:Night Writer-Reader will recognize.

Braille Flag Chart

Oddly it may seem strange to have a Braille Flag chart.  But going back to Braille's roots it is a secret code made for people who could see, as the original form was known as knight writing for military operations so that one could read without light.

Braille flags follow the code set by standard Braille, but uses the colour code as established by the order of the rainbow.