The Percent symbol is used in math and to indicate the percentage of the number, and it means one part of a hundred. It's usually used in informal writing, advertising or tables in research papers. The percent symbol is also used in magazines and papers to save space. To use the percent symbol in the American keyboard, you hold the shift key and press number five on the line of numbers in the top. In writing, you should insert the symbol after the given number.
In programming, the percent sign is used to indicate the modulus. The percent symbol takes the shape of slanted slash with one circle on each side.