The EE-Base Design System includes a small library of UI icons based off Collecticons to be used on web applications. This icon font can be easily customized using just CSS: size, color, drop shadow, etc.
To see names of icon classes on hover make sure to use chrome or firefox
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You can place EE icons just about anywhere using the respective CSS class. The icon library is designed to be used with inline elements (we like the <i> tag for brevity, but using a <span> is more semantically correct).
You can also use scss extends for a semantic approach:
The advantage of the semantic approach is that there’s no need for any extra markup and it is possible to choose on which pseudo-element to apply the icon.