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The support for TrueType font symbols gives you a lot of options. There are a large number of font collections out there, some free, some premium. For example, I've always liked Font Awesome (https://fontawesome.com/) which has free and paid-for versions. If you share data/workspaces with others, just make sure they have the required fonts installed.
Cartography for other geometry types is a different matter and I wish Pro could support custom fill patterns (bitmaps, SVGs, etc.). A better colour picker too. It really is well behind on things like this.