--- a/.emacs-my	Wed Feb 10 14:19:10 2016 +0200
+++ b/.emacs-my	Wed Feb 10 15:29:09 2016 +0200
@@ -1869,8 +1869,8 @@
   (gnus-demon-add-handler 'gnus-demon-scan-news 10 t))
 
 ;; Show prefix and 'To' field instead 'From' for my mails.
-(setq gnus-summary-to-prefix "==> ")
-(setq gnus-summary-newsgroup-prefix "==> ")
+(setq gnus-summary-to-prefix (if window-system "▒ " "==> "))
+(setq gnus-summary-newsgroup-prefix (if window-system "▒ " "==> "))
 (setq gnus-ignored-from-addresses (list (regexp-quote user-mail-address) (regexp-quote user-full-name)))
 
 (setq gnus-posting-styles