From http://www.w3schools.com (Copyright Refsnes Data)

WML Entities

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Character Entities

Result Description Entity Name Entity Number
& ampersand & & 
' apostrophe ' '
> greater-than > >
< less-than &lt; &#60;
  non-breaking space &nbsp; &#160;
" quotation mark &quot; &#34;
­ soft hyphen &shy; &#173;

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From http://www.w3schools.com (Copyright Refsnes Data)