Subscripts and Superscripts in Latex
The symbols _ and ^ are used to represent subscript and superscript terms.
Example
\documentclass{article}
\begin{document}
% SUPERSCRIPT
\begin{equation}
I^2 + I^2 + I^2 = 0 \
\end{equation}
% SUBSCRIPT
\begin{equation}
I_2 + I_3 + I_2 = 0 \
\end{equation}
% SUPER AND SUBSCRIPT BOTH
\begin{equation}
I_1^2 + I_2^2 + I_3^2 = 0 \
\end{equation}
\end{document}
Output
