[R] How to look up explanations for %in%?

[casshyr]

I tried googling that, but the search engine just ignores the "%" sign and is
not giving me meaningful search results. I ended up doing a trial and error
and kinda figured out what it does. But I am wondering if there is a good
website that shows you all the meanings behind R's commands that involve %%?

Thanks!
Casper
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