"How does PrimeNG use classes to display icons instead of HTML tags?

I was reading through the GitHub project and noticed that icons extend from a BaseIcon class, which in turn extends from a BaseComponent. From what I saw, you can use the selector, for example, <AngleUpIcon>, to display the SVG of that icon. However, I would like to understand how PrimeNG manages to display icons using classes, for example:
<i class="pi pi-user" style="font-size: 2.5rem"></i>.

Find a clear explanation of how PrimeNG achieves the functionality of displaying icons using classes instead of HTML tags, possibly through custom components or other mechanisms.

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