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Font Awesome
Example of folder-open at 6x   Example of folder-open at 5x    Example of folder-open at 4x    Example of folder-open at 3x    Example of folder-open at 2x   Example of folder-open

fa-folder-open · Unicode: f07c · Created: v1.0 · Categories: Web Application Icons

After you get up and running, you can place Font Awesome icons just about anywhere with the <i> tag:

Example of folder-open fa-folder-open 
<i class="fa fa-folder-open" aria-hidden="true"></i>

Note: to improve web accessibility, we recommend using aria-hidden="true" to hide icons used purely for decoration.

Looking for more? Check out the examples.