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

Hello

Hello

An inline math example: $\alpha$

Here is Ampere's Law with Maxwell's addition:

$$ \oint_C \vec{B}\circ \d\vec{l} = \mu_0 \left( I_{\text{enc}} + \varepsilon_0 \frac{\d}{\d t} \int_S {\vec{E} \circ \hat{n}}\; \d a \right) $$

Pi symbol: $$\uppi$$

Monospace text: $$\verb|mono|$$

Permutation: $$10\permute4$$

Tangent: $$\tan(90)$$

Mid: $$\shortmid\text{\texttrademark}$$