Special Characters In Latex

I use the stack for CJK Fonts... The Noto CJK fonts are licensed under the OFL see https://openfontlicense.org

Hello

Hello

$\backslash [\backslash alpha\backslash ]$ $$\def\d{\mathrm{d}} \oint_C \vec{B}\circ \d\vec{l} = \mu_0 \left( I_{\text{enc}} + \varepsilon_0 \frac{\d}{\d t} \int_S {\vec{E} \circ \hat{n}}\; \d a \right)$$ $$\def\d{\mathrm{d}} \uppi$$ $$\def\d{\mathrm{d}} \verb|mono|$$ $$\def\d{\mathrm{d}} 10\permute4$$ $$\mathrm{t}\mathrm{a}{\mathrm{n}}^{\mathrm{d}}(90)$$