Have you heard about $\gamma$ ?

Calculus Level 5

$\large \dfrac1\gamma \lim _{ x\rightarrow 0 }{ \ln { \sqrt [ x ]{ x! } } } =\, ?$

Notation: $\gamma$ denotes the Euler-Mascheroni constant, $\gamma \approx 0.5772$ .

Have you heard about γ\gammaγ?