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Reduced Planck Constant

The $\textit{Reduced Planck Constant}$, or $\textit{Dirac Constant}$, is used in applications where frequency is expressed in terms of radians per second ($\textit{angular frequency}$) instead of cycles per second. In such cases a factor of $\pi$ is absorbed into the constant.

http://en.wikipedia.org/wiki/Planck_constant

http://www.iso.org/iso/catalogue_detail?csnumber=31895

$\hbar = \frac{h}{2\pi}$, where $h$ is the Planck constant.

$\hbar$