There are no weird letters in maths.
Greek mathematicians were responsible for a significant amount of the early mathematical work and they, naturally used Greek letters. Many of these letters are still used today. Just because you are not familiar with characters in the Greek alphabet does not make them "weird letters".
Math uses letters to indicate that specific numbers are not known or as an abbreviation for certain constant.
In ordinary everyday letters . . . pi In Greek letters . . . Π
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Letters used in math are called variables.
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contribute to math
Math uses letters to indicate that specific numbers are not known or as an abbreviation for certain constant.
there can be in a weird way i guess!
you type
Satan put letters in math during the time period in which the emancipation proclamation was being signed
No, where do you get such weird ideas? You NEED math for physics and engineering!
In ordinary everyday letters . . . pi In Greek letters . . . Π
one word: hitman.
Variables
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Trig
Letters used in math are called variables.