Well, it seems that those letters are shortcuts (SC) in Konqueror when you hit Control. Hit Control again and the SC will desapear, the problem is that you will see only one letter for each SC so you have to memorize the ones you like. 
Weird letters II
March 15, 2006 at 3:26 am (Debian, KDE, Open Source, Wondering)
TOM said,
April 13, 2006 at 6:08 pm
(SC)
Alejandro said,
April 13, 2006 at 10:31 pm
not StarCraft, but ShortCuts
ok said,
May 10, 2006 at 2:38 pm
ya smell!!
Alejandro said,
May 11, 2006 at 1:35 am