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?

c# .net xml-comments
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