Generic font families:
serif: Fonts with small decorative lines (serifs) at the ends of strokes. Examples include Times New Roman and Georgia.
sans-serif: Fonts without serifs. Examples include Arial and Verdana.
None of these generic families are designed to display icons, and attempting to use them as a fallback for an icon font would result in incorrect or unreadable characters being displayed instead of the intended icons.
Therefore, when using icon fonts, it is crucial to ensure that the specific icon font file is properly loaded and accessible, as there is no universal generic fallback that can replicate its functionality.