Lower Case π Day Greek Number Flag

Greeks used letters to represent numbers as well.  In this case Gamma represent 3, Alpha represents 1, and Delta represents 4.  Reason being, Γis the 3rd letter, α is the 1st letter, and δ is the fourth letter in the Greek Alphabet.

Japanese Pi Flag

Putting the Pisces in π Day Flag

Turkish π Day Flag

Singapore π Day Flag

Saudi Arabian π Day Flag

Although in the West we call our numbers 'Arabic' the Arabs have their own numbers, which is used in this flag-as real Arabic numbers.  Perhaps the West should call thier numbers 'Euroric Numbers' instead?

South Korean π Day Flag!