In finance, specifically in foreign exchange markets, a percentage in point or price interest point (pip) is a unit of change in an exchange rate of a currency pair.. The major currencies (except the Japanese yen) are traditionally priced to four decimal places, and a pip is one unit of the fourth decimal place: for dollar currencies this is to 1/100 of a cent.

In mathematics, a percentage (from Latin per centum "by a hundred") is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign, ... Percentage point difference of 1 part in 100; Per mille (‰) 1 part in 1,000; Basis point (bp) difference of 1 …