Minus symbol ( − ) is a mathematical operator. Minus sign has many uses. First, it is used as a subtraction operator. The second usage is the value of a function for any real or complex argument is the additive inverse of this function. The minus sign is also used as a prefix of numeric constant. If placed before a number, it means that this number has a negative value. In grading systems, the minus sign means a lower level of grades. In programming, it is used as a determination operator.
Hyphen sign ( -) is usually used as an alternative of the minus sign; it can be used as bullet sign.