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In the following example, & and Δ are OK but Δ is not (the latter two are both Δ). The compiler issues a warning similar to:

 warning CS1570: XML comment on 'XXX.DocumentedMethod()' has badly formed XML -- 'Reference to undefined entity 'Delta'.' 
 /// <summary> /// &amp; &Delta; &#916; /// </summary> public void DocumentedMethod() { }

What are the supported character entities for XML comments?

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It's not a matter of comments, it's XML itself. XML only inherently knows about &amp;, &lt;, &gt;, &apos; and &quot; as well as the numeric entities. Anything else has to be declared explicitly.

See section 4.6 of the spec for further information.

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Thanks! I am honored that Jon Skeet answered my question =)

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