e same glyph could be used to depict both characters --&gt;

&lt;!-- Arrows --&gt;
&lt;!ENTITY larr     CDATA "&amp;#8592;" -- leftwards arrow, U+2190 ISOnum --&gt;
&lt;!ENTITY uarr     CDATA "&amp;#8593;" -- upwards arrow, U+2191 ISOnum--&gt;
&lt;!ENTITY rarr     CDATA "&amp;#8594;" -- rightwards arrow, U+2192 ISOnum --&gt;
&lt;!ENTITY darr     CDATA "&amp;#8595;" -- downwards arrow, U+2193 ISOnum --&gt;
&lt;!ENTITY harr     CDATA "&amp;#8596;" -- left right arrow, U+2194 ISOamsa --&gt;
&lt;!ENTITY crarr  