Alternatively referred to as a dash, minus sign, subtract, or negative; the hyphen ( - ) is a punctuation mark found on the underscore key next to the "0" computer key on US keyboards. In computers, the hyphen is commonly used in computer programming and mathematics to subtract one number from another. Words with hyphens are used in some compound words as a way to make the word easier to read and help clarify words that are used together. Some examples of words with hyphens: to-do, merry-go-round, high-risk, T-shirt, and sixty-six. Below are some examples of a hyphen is used.
Used in a math formula
2 - 1 = 1
Used in a word processor
In many word processors, an optional hyphen or hyphenation is automatically inserted when a word is cut off by the program because it has reached the end of the line. When formatting marks are enabled, these hyphens are represented with the conditional hyphen mark.