1, the symbol shapes are different: the symbol of the dollar is in the shape of a horizontal bar, and its size is relatively small, which is usually used to represent the value of the dollar; The symbol of Hong Kong dollar is a circle with the letter "HK", which is relatively large and is usually used to represent the value of Hong Kong dollar.

2. Different colors: the color of the dollar symbol is silver, and the color of the Hong Kong dollar symbol is red.

3. Different cultural meanings: The dollar symbol has an important symbol in American culture, representing wealth, economy and global influence. The symbol of Hong Kong dollar is not only a currency in Hong Kong culture, but also shows the status and characteristics of Hong Kong as an international financial center.