[R] call object from character?

[chuck.01]

Let say I have an object (I hope my terminology is correct) a
a <- 12
> a
[1] 12

And "a" has been assigned the number 12, or whatever
And lets say I have a character "call_A"
call_A <- "a"
>call_A
[1] "a"

What is the function "F" that allows this to happen:
> F( call_A )
[1] 12


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