All the LaTex are based on the WordPress Jetpack Latex Plugin and the KaTex used by Evernote(macOS). This Cheat Sheet is updated constantly when I find some insteresting yet hard to type LaTex symbol.
Logical Exclusive OR
Yields in One Step – Vdash
Plus Minus Sign
Less Than or Equal to
Center Text in WordPress
In some Latex context, you may use $$some text here$$ to make the LaTex Math formula center, but in WordPress with the Jetpack plugin, the only way I found to do that is to insert customized HTML.
For example, to insert and center it as a formula