What is the meaning of Double_eagle?

A gold coin with a face value of $20 formerly used in the United States, the double of the US eagle coin.

Three under par, one stroke short of an ace (a hole in one) on a par-five hole.

A representation of an eagle with two heads, as in the heraldic arms of Russia and Austria and in iconography from Antiquity onward (especially in the Roman Empire).

Source: wiktionary.org