Each element can be looked up by name, see Examples
commonprojections
An object of class list
of length 4.
This should be use only for a convenient reference to look up the projection strings commonly in use. There's no guarantee that this would be appropriate and you should seek cartographic expertise.
names(commonprojections)
#> Error in eval(expr, envir, enclos): object 'commonprojections' not found
commonprojections[["polar"]]
#> Error in eval(expr, envir, enclos): object 'commonprojections' not found