if you use the Glyphicons icon of bootstrap, the following code can display a cup.
<span class="glyphicon glyphicon-glass" aria-hidden="true"></span>
check what CSS looks like 
each icon corresponds to a different hexadecimal, such as\ e001
here.how is the hexadecimal corresponding to each icon generated? Why can"t the icon be displayed when it is changed to e002?
have you ever used font-awesome or something like that?
these all need to load a font file, and this \ e001 corresponds to the character of a cup (the same length as) in that font file.
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