\_The underscore symbol is used in LaTeX to denote subscripts in mathematical expressions. It allows for the placement of a character or group of characters below the baseline of the preceding character, typically used in mathematical and scientific notations.
Subscript notation for indexing elements in a sequence or array.
a_i = b_i + c_iSubscript with multiple characters using curly braces for clarity.
x_{n+1} = x_n + v_nSubscript used in a physics formula to denote a specific energy state.
E_0 = mc^2