Yesterday I learned **3** more LaTeX symbols while I was reviewing a paper ðŸ˜º:

- an equivalence symbol:
`$\equiv$`

$\equiv$, - use
`\xi`

not`$\ksi$`

for $\xi$, `$\widehat{}$`

for estimators (in statistics), for instance: $\widehat{\xi}$.

Also, it was a good opportunity to remind myself that when looking for a specific symbol, one can always google an approximate description of the it, **or** one can use Detexify an extremely helpful LaTeX handwritten symbol recognition system!