gnus-group-name-charset-method-alist

gnus-group-name-charset-method-alist is a variable defined in `gnus-group.el'.
Its value is

nil

Documentation:
Alist of method and the charset for group names.

For example:
(((nntp "news.com.cn") . cn-gb-2312))

You can customize this variable.

This variable was introduced, or its default value was changed, in version 21.1 of Emacs.