Because you’re comparing concepts that belong to different categories; there’s no reason for them to be the same.
Mathematics as a concept describes objective facts about reality. Specifically, facts regarding numbers, geometry, logic and so on. Maths is universal as long as you are describing the same reality, same way as physics describes objective facts about the reality of matter.
Language and alphabets are not objective facts of reality, they are shared constructs humanity invented to facilitate the exchange of ideas amongst ourselves. They are entirely arbitrary, and hence not universal, but as long as they are consistent within a given scope (tribe, village, culture, planet etc) they serve their purpose.
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