What does the white portion of flag represents?

Answer 1

It was noticed that a saltire was created by white clouds against a blue sky after the battle of Athelstaneford. The saltire was the cross of St. Andrew and therefore the colours were adopted for the flag.

Answer 2

The Philippines has a white triangle in their flag. It is used to symbolize the notion of equality and fraternity.

Answer 3

It represenents half of the 13 colonies.

Answer 4

Purity