How do you type the h-bar(ℏ) symbol in LaTeX?

You can print the h-bar or Reduced Plank constant by default \hbar command in the latex document.

Symbol	H-bar
Type of symbol	Mathematics
Package (requirement)	No
Argument	No
Latex command	\hbar
Example	\hbar → ℏ

\documentclass{article}
\begin{document}
   \[ E = \hbar \omega \]
   \[ \hbar = \frac{h}{2\pi} \]
   \[ p = \hbar K \] 
\end{document}

Output :

And different packages have the same command, which returns the same output. Examples are amsmath, fdsymbol, and boisik.

There is another type of h-bar symbol in latex that has structural light differences. For this, take help of boisik package.

\documentclass{article}
\usepackage{boisik}
\begin{document}
   \[ J^2 = j(j+1)^2 \hslash  \]
   \[ J_z = m \hslash \]
   \[ \Delta x . \Delta p \geq \frac{\hslash}{2} \]
\end{document}

Output :

Use another package for h-bar symbol in LaTeX like tipa, wsuipa, phonetic, etc.

The following program uses four different packages and different commands to define the same h-bar symbol.

Command (package)	Symbol
\textcrh (tipa)	ℏ
\crossh (wsuipa)	ℏ
\plank (phonetic)	ℏ
\textcrh (t4phonet)	ℏ

\documentclass{article}
\usepackage{tipa, phonetic, wsuipa}
\begin{document}
   $ p^u = \textcrh K^u $\\[6pt]
   $ p^N $ = \planck $\left(\frac{w}{c}, \vec{K} \right) $\\[6pt]
   \crossh = 1.056 $ \times 10^{-34} J.S $
\end{document}

Output :

When you came from the Last Paragraph of this tutorial, then I hope you’ve got your answer like the mind that you wanted.