In R, the "$" symbol is used to extract a component of an object. For example, if you have a data frame called "mydata", and you want to extract a column called "mycolumn", you can use the "$" operator like this:
``` 
mydata$mycolumn
``` 
The "$" symbol tells R to look inside the "mydata" object and extract the component called "mycolumn". This is a convenient way to access individual components of a complex object, like a data frame, list, or environment.
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