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Another weird case: In Google's server-side JS environment Apps Script, function names that end with _ are treated as private functions that cannot be called directly by the user or enumerated.

1. https://developers.google.com/apps-script/guides/html/commun...

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In the Python world I was in, trailing underscores is used to work around the ban on reserved words. The language grabs some of the best names for itself!

So a variable that really ought to be named `class` you name `class_`.

In java usually clazz

That's what I used to do before discovering this.

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