Symbol of Shia

What is the symbol of Shia? 

What is Shiite Flag?

What is Sunni symbol?

These are questions that people unfamiliar with Islam think and ask about it in google! They think that all sects of Islam have their own flag, while there is no official flag for Islam. However huge propaganda of non Islamic group of ISIS in the cyberspace, biased some people to think that like countries which have their own flags, Shia and Sunni have some special flags or symbols. 

However I think that there must be an answer for those who search in google for the term "Shia Symbol". After all I found the best symbol for Shia to be AhlulBayt of the Prophet who are innocent according to Quran 33:33 and includes all Twelve Imams of Shiite.

Shia Symbol - Allah, Muhammad (pbuh) and his AhlulBayt including Fatima (sa) and 12 Imams (as)

Indeed Allah desires to repel all impurity from you, O People of the Household (AhlulBayt), and purify you with a thorough purification.

إِنَّمَا يُرِ‌يدُ اللَّـهُ لِيُذْهِبَ عَنكُمُ الرِّ‌جْسَ أَهْلَ الْبَيْتِ وَيُطَهِّرَ‌كُمْ تَطْهِيرً‌ا ﴿٣٣﴾