Date: 06/12/07 (Java Web)    Keywords: html

WordPress in its infinite wisdom consumes one dash ( - ) and converts the other when there are two consecutive dashes like this: --. The solution is to use - twice instead of dash. - is the HTML escape sequence for a dash or hyphen or minus sign. This ASCII character is a generic, multipurpose [...]

Source: http://blog.taragana.com/index.php/archive/how-to-add-double-dash-in-wordpress/