The only "mathematical" (it's really more geometrical) symbol I can think of fitting the description means "perpendicular."
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The Upside down T symbol indicates perpendicular lines.
It is the symbol for 'perpendicular'.
T in the metric unit of weight is ton.
It might be the missing number.
It say "368 milliliters down" which in slang means that your lightweight. Jamie T says a lot that he is a light weight