In the United States, standard computer keyboards have two shift keys. One of these keys is on the left side directly below the "caps lock" and the other is on the right side directly below the enter key.
U.S. keyboards include a row of number keys directly above the top row of letter keys. Each of these number keys features a punctuation mark such as the percent symbol above the number 5. By holding down a shift key and striking a number key, one can type the corresponding symbol. The shift key is also used to access upper case letters.
Even in countries other than the United States, computer keyboards typically include two shift keys. The placement of symbol characters, however, varies from country to country.