With it’s admin redesign in version 3.8, WordPress also launched a sporty new icon font that powers the menu icons. Before, menu icons were just images linked to using the
menu_icon parameter when you registered the custom post type. You can still do this, but today I learned that you can also use a Dashicon in place of an image for your CTP menu icons.
It’s easy: when you register your CPT, enter the classname of any Dashicon in the
menu_icon parameter. WordPress will use that a your CPT’s menu icon.
For example, If I’m working on a Slide CPT, I can use the Slide Dashicon like so: