markdown fields Customization Guide
icons
Libraries icons Google (https://design.google.com/icons/) and Font-Awesome (https://fortawesome.github.io/Font-Awesome/icons/).
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icons google
They are defined within a beacon i, the material-class icons, the icon name and class size. Tiny, small, medium, large note, when the icon of the name contains a _ (underscore) the escape character (bar angled left) is placed in front.
Icons are-awesome
They are defined within an i tag, the F Class, F-xxx icon indicating the type and size such as fa-2x (see website are-awesome)