Validator says "unescaped ampersand character"

Found an unescaped ampersand character ('&') or there's a character reference that's missing an ending semicolon. NOTE: To use a literal ampersand it must be encoded as "&", even in URLs. This is because '&' is an escape character in HTML/XHTML.

<li><a href="">Roof Pitch Degrees&deg</a></li>
how should this be written ?
Who is Participating?
Dave BaldwinFixer of ProblemsCommented:
Loganathan NatarajanLAMP DeveloperCommented:
it seems, ambiguous ampersands always invalid in W3C standard.. ref.
isnoend2001Author Commented:
Cannot check now my site is down, but just adding the semicolon (;)i am assuming fixes the issue
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