The Nazi Eagle is a symbol developed originally by the Nazi Party in Germany in the 1920s (also becoming a symbol of the German government after the Nazis took power), based loosely on traditional German coats of arms. Following World War II, the symbol was appropriated by neo-Nazis and other white supremacists worldwide, with many variations. The symbol originally featured an eagle clutching a swastika, but many variations replace the swastika with some other hate symbol, such as SS bolts or a Celtic Cross. Occasionally, extremists will leave the circle blank where the swastika normally would appear; this seems to be more common in countries where the swastika is prohibited.
It should be noted that eagles are a common symbol among nations worldwide, including the United States, and not every image of an eagle is derivative of the Nazi eagle. It is not uncommon, for example, for some Americans to mistake the Blue Eagle logo of the Roosevelt-era National Recovery Administration for a Nazi-derived symbol.