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This is fun.

You can tell MacOS's "Text Replacements" setting to replace a typed LaTeX command with the associated unicode character.

Some apps will just ignore this, but it shows up most places. And it still compiles correctly when used inside LaTeX or MathJax views (for example, in Obsidian).

Easy way to insert characters like α, β, etc into a post. You can do subscripts and superscripts, too. For example: H₀