Exit Code Flag for North Korea - 99

99 is the number of the GREAT ONE, but it is also the exit code for North Korea.

http://www.kcna.kp/kcna.user.home.retrieveHomeInfoList.kcmsf

Calling Exit Code for Australia - 0011

If you are in Australia and are trying to call outside the nation, you have to access the international exit number which is 0011.  In light of this, here is the associated flag to help one remember.  Australia has a unique code.  Most nations use 00 or 011 but Australia is its own continent after all.

https://www.telstra.com.au/

Heterosexual Pride Flag, Feminine Dominance

This is a heterosexual pride flag whereby the female leads the relationship.  This is represented by economic superiority, height, decision making, and social rank.  Usually these conditions are rare, since the male species often dominates.

It may seem unnatural for such relationships to occur, but there are instances where mother nature allows for such conditions.  Namely the hyena is a good example.  Female hyenas are bigger, higher in social rank, bring home the bacon, and boss the males around.  Likewise many insects are arranged where males are under feminine control and much smaller, or simply bred for reproductive purposes and discarded. 

As for the human kingdom, a hetero-female dominated relationship in this manner is virtually non-existent. 

Morocco Calling Code Flag 212

The flag international calling flag for Morocco is red, orange, black, and white.  Reason being, the numbers are coded colour, as based in the order of the rainbow.  So, the number is 212.  Because orange is the second number of the rainbow and red is the first number of the rainbow.

https://en.wikipedia.org/wiki/Maroc_Telecom

Uganda Calling Code Flag 256

Uganda gets the coveted 16 bit squared number of 256 for its calling code.
https://www.utl.co.ug/
https://www.utl.co.ug/

Czech Calling Code Flag 420

The lucky nation with 420 as its international prefix is the Czech.  In this case the numbers are coded to colours.  Green is 4, orange is 2 and white is 0.

Calling Code Flag for Nicaragua 505

The country code for Nicaragua is 505, and this flag is reflective of that number.  Blue/cyan is coded to 5, while white is coded to 0.  The association is based upon the order of the rainbow.  Blue is the 5th colour while white is essential colour to represent zero.