RemixIconEx.Media.volume_up

You're seeing just the function volume_up, go back to RemixIconEx.Media module for more information.
Link to this function

volume_up(icon_css_class \\ "icon")

iex> Elixir.RemixIconEx.Media.volume_up()
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" class="icon">
  <path d="M10 7.22L6.603 10H3v4h3.603L10 16.78V7.22zM5.889 16H2a1 1 0 0 1-1-1V9a1 1 0 0 1 1-1h3.889l5.294-4.332a.5.5 0 0 1 .817.387v15.89a.5.5 0 0 1-.817.387L5.89 16zm13.517 4.134l-1.416-1.416A8.978 8.978 0 0 0 21 12a8.982 8.982 0 0 0-3.304-6.968l1.42-1.42A10.976 10.976 0 0 1 23 12c0 3.223-1.386 6.122-3.594 8.134zm-3.543-3.543l-1.422-1.422A3.993 3.993 0 0 0 16 12c0-1.43-.75-2.685-1.88-3.392l1.439-1.439A5.991 5.991 0 0 1 18 12c0 1.842-.83 3.49-2.137 4.591z" />
</svg>

example usage

svg.icon {
  width: 96;
  height: 96;
}