The only "mathematical" (it's really more geometrical) symbol I can think of fitting the description means "perpendicular."
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.
You normally multiply a number by another number
The Upside down T symbol indicates perpendicular lines.
It is the symbol for 'perpendicular'.
Upside-down T
A symbol is something that stands for or represents an idea, quality, condition, or other abstraction.
centered
The book Upside Down in the Middle of Nowhere by Julie T. Lamana has 320 pages.
An upside down T.
They look like an upside-down "T".
It looks like an upside-down "T".
You turn Upside down.
like a T with an upside down tear on it
A centered tab stop