title: How to reference an glyph in iconfont by word?
body: <p>I want to use iconfont in my project,and custom the font file by fontforge.</p>
  
  <p>I know glyph can be referenced by unicode in html or css, such as <code>&lt;i&gt;&amp;#xe030;&lt;/i&gt;</code> and <code>&amp;::before{content: "\e030";}</code>.While I find some people can reference glyph by this: <code>&lt;i&gt;library_music&lt;/i&gt;</code>.I guess that's glyph name, but I cant find the 'library_music' definition in fontforge.</p>
  
  <p>Here is my html and css code.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>@font-face {
    font-family: 'testfont';
    src: url(https://fonts.gstatic.com/s/materialicons/v48/flUhRq6tzZclQEJ-Vdg-IuiaDsNc.woff2) format('woff2');
  }
  
  i { font-family: "testfont"; }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;i&gt;library_music&lt;/i&gt;
  &lt;i&gt;&amp;#xe030;&lt;/i&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>I hope some one can tell me what is the principle of 'library_music' reference and how can I custom the word in fontforge.</p>
  
  <p>thx a lot.</p>