Headed Eagle

Double Headed Eagle ?
I’ve seen such an icon on several places. What do it mean and what does it indicate ? What’s the story behind it ?
The double-headed eagle is a common symbol in heraldry and vexillology. It is most commonly associated with the Holy Roman Empire and the Byzantine Empire.
Double-headed eagles have been present in imagery for millennia. The two-headed eagle can be found in the archaeological remains of the Sumerian civilization and through the Hittite civilization, dating from a period that ranges from the 20th century BC to the 7th century BC.
Cylindric seals discovered in Bogazkoy, an old Hittite capital in modern-day Turkey, represent clearly a two-headed eagle with spread wings.
THanks
TKN
Secret Society Symbolism – The Double Headed Eagle