It's called a hyphen !
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As for example in the fraction 1/2 the / symbol is the solidus line.
it is the equal sign = with the symbol ~ over it
Two non-parallel lines in space that do not intersect are called skew lines. The skew line symbol is a short horizontal bar above the two identifying letters.
If you mean the symbol &, it is called an ampersand.
It is a symbol for the word "with".