HTML Entity for DASH

Putting two dashes on a page sometimes, like this -- in rare occassions messes the HTML up.

For instance, if you enter -- into your Wordpress blog it'll actually munch it into a single -. This doesn't work well for code that requires --options --to --be --specified --this --way.

The HTML entity for – is &ndash and the longer — is — but what is the HTML entity to enter NORMAL DASH - in a page?