Whether the class name is dev-ready (meaning it's fully vetted and tested and safe to use) or prototype (which means it's not fully vetted yet).
Restrict
The selector that the class name is allowed to be used on.
Variant
The base level pattern for a component. A variant can be extended to create another variant of that component, for example, a stateful button is a derivative of the base button.
Modifier
A single class that can be added to an HTML element of a component to modify its output. Typically these will be colors, sizing and positioning.