[rchhuon99]

are you absolute value|...|?

[ms772]

are you one of the symbols shown in symbol tables here - https://en.wikipedia.org/wiki/List_of_mathematical_symbols ?

are you one of the symbols shown in symbol tables here - https://en.wikipedia.org/wiki/List_of_mathematical_symbols ?

[hiemdal]

Are you aleph?

[yousofine]

Are you the parallel symbol ∥ ?

[rchhuon99]

Are you the end of proof∎?

[ms772]

are you a greek letter?

[Mickey101]

Are you a ∑ (summation)?

In the handy wikipedia page found by ms772 in question 69 ( https://en.wikipedia.org/wiki/List_of_mathematical_symbols ) are you in the section titled 'Basic Symbols'?

[rchhuon99]

are you the proportionality ∝ symbol?

[ms772]

Are you in section "Symbols that point left or right" here https://en.wikipedia.org/wiki/List_of_mathematical_symbols ?

Is the symbol you are your favorite one (or do you at least like him)?

Are you therefore ( ∴ )?

[rchhuon99]

Are you the because sign ∵?

[ms772]

are you one of the following: plus, minus, multiplication, division?