The term “half dollar” may refer to a half-unit of several currencies that are named “dollar”. Normally, $1 is divided into 100 cents, so a half dollar is equal to 50 cents. Coins and/or banknotes of that amount are as such denominated at a value of 50 cents. More than a dozen countries are known to have their own unique dollar currency, out of these not all use the 50 cent piece or half dollar. (source)