NLS_LANG, character sets & more – Part 2

Some days ago I wrote about NLS_LANG, character sets & more. Today I saw another neat effect. I was trying to do it right, but my messages from SQL*Plus still looked scrambled:


The thing is, that the characters I need are simply not present in the default font. When I change the font, the same screen now looks somehow different:


Maybe I should switch from German to English and ASCII 7 completely…