I don't care about my reputation, but I have some confusion about symbols in my Stack Exchange ID (shown below)
I don't understand the meaning of these symbols and numbers.
Why are these symbols and numbers in my ID?
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This represents your flair and denotes the number of gold, silver and bronze badges you've received on that specific site (or across all sites if you view your network profile). Specific to your example, you have
on Mathematics.SE; that site uses geometric shapes for badge icons.
Visualizations of the respective badges differ across sites, since they may have a local design element that has been created. For example, Academia.SE uses graduation caps for their badges