describe-variable

describe-variable is an interactive autoloaded compiled Lisp function in `help-fns.el'.

It is bound to C-h v, <f1> v, <help> v, <menu-bar> <help-menu> <describe> <describe-variable>.

(describe-variable VARIABLE &optional BUFFER FRAME)

Display the full documentation of VARIABLE (a symbol).
Returns the documentation as a string, also.
If VARIABLE has a buffer-local value in BUFFER or FRAME
(default to the current buffer and current frame),
it is displayed along with the global value.