How to write the following sign? [duplicate]

Question

I am writing my project work in LaTeX, but I am facing certain difficulties to write the sign (it is similar to hash sign, but not clearly).

Please help me to write this:

Answer 1

Next time you need a symbol definition try the Detexify website. You freehand draw your symbol in the box and the site makes suggestions for the latex code to use.

Answer 2

The symbol is \sharp:

\documentclass{article}
\begin{document}
$T^\sharp$
\end{document}