怎么unbound symbol

不知道我词用的对不对,我想删除一个symbol,从global的obarry里删除。但是网上似乎没有相关的信息。

https://www.gnu.org/software/emacs/manual/html_node/elisp/Creating-Symbols.html

— Function: unintern symbol obarray

This function deletes symbol from the obarray obarray. If symbol is not actually in the obarray, unintern does nothing. If obarray is nil, the current obarray is used.