Noun
hyphen-minus (plural hyphen-minuses)
The symbol -, used as a hyphen, a minus sign and a dash.
ASCII does not have a minus sign, so its hyphen-minus character (code is 45 decimal or 2D hexadecimal) would be used. Source: Internet
However, the Unicode hyphen is awkward to enter on most keyboards, so the hyphen-minus character remains very common. Source: Internet
Various implementations of the getopt() function to parse command-line options additionally allow the use of two hyphen-minus characters ( -- ) to specify long option names that are more descriptive than their single-letter equivalents. Source: Internet