The fraction bar is a vinculum, or a link between two objects considered as a whole.
Symbol
The fraction bar symbol is a horizontal line as in [latex]\frac{2}{3}[/latex] or [latex]\frac{2x\space+\space5}{3\space+\space5x}[/latex].
In some texts or computer formulas in particular, an oblique line is used instead of a fraction bar: 2/3.
