3.1.3 Summary Buffer Mode Line 
You can also change the format of the summary mode bar (see section 8.4.2 Mode Line Formatting).  Set gnus-summary-mode-line-format to whatever you
like.  The default is `Gnus: %%b [%A] %Z'.
Here are the elements you can play with:
- `G'
 - Group name.
 - `p'
 - Unprefixed group name.
 - `A'
 - Current article number.
 - `z'
 - Current article score.
 - `V'
 - Gnus version.
 - `U'
 - Number of unread articles in this group.
 - `e'
 - Number of unread articles in this group that aren't displayed in the
summary buffer.
 - `Z'
 - A string with the number of unread and unselected articles represented
either as `<%U(+%e) more>' if there are both unread and unselected
articles, and just as `<%U more>' if there are just unread articles
and no unselected ones.
 - `g'
 - Shortish group name.  For instance, `rec.arts.anime' will be
shortened to `r.a.anime'.
 - `S'
 - Subject of the current article.
 - `u'
 - User-defined spec (see section 8.4.4 User-Defined Specs).
 - `s'
 - Name of the current score file (see section 7. Scoring).
 - `d'
 - Number of dormant articles (see section 3.7.1 Unread Articles).
 - `t'
 - Number of ticked articles (see section 3.7.1 Unread Articles).
 - `r'
 - Number of articles that have been marked as read in this session.
 - `E'
 - Number of articles expunged by the score files.
 
  
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