The emoji has the symbolic green of Pakistan with the symbol of a crescent moon and star as depicted on the national flag.
To use the emoji, you just simply have to use the hashtags and the emoji will be integrated with your tweet.
Here is the list of tweets which you can use for the emoji:
#PakistanZindabad
#Pakistan
#PKIndependenceDay
#Aug14
#IndependenceDayPakistan
#IndependenceDayPK
#Pak
#آزادی_مبارک
Now you can use the national flag on all your tweets as well.
