U+2217 ISOtech --&gt;
&lt;!ENTITY radic    CDATA "&amp;#8730;" -- square root = radical sign,
                                     U+221A ISOtech --&gt;
&lt;!ENTITY prop     CDATA "&amp;#8733;" -- proportional to, U+221D ISOtech --&gt;
&lt;!ENTITY infin    CDATA "&amp;#8734;" -- infinity, U+221E ISOtech --&gt;
&lt;!ENTITY ang      CDATA "&amp;#8736;" -- angle, U+2220 ISOamso --&gt;
&lt;!ENTITY and      CDATA "&amp;#8743;" -- logical and = wedge, U+2227 ISOtech --&gt;
&lt;!ENTITY or       CDATA "&amp;#8744;"