What exactly does this symbol mean, and what is it called? It looks like the any function $f(x)$, but with a line drawn over the entire thing.

Question

I've been seeing it a lot recently, and I'm not sure what it's called, and I've searching on google things like "$f(x)$ with a bar over it". Even just a name for it would be helpful $f(x)$ with a line over the entire thing

I'm tagging complex numbers because that's where I first saw the symbol

Answer 1

The overline symbol is called a vinculum.

It groups symbols together and has several uses in mathematics,

including square roots, repeating decimals, and logical negation.

In the context of complex numbers, it denotes the complex conjugate.