Original: The district Sächsische Schweiz uses the name of its main town, Pirna, in its code PIR, to avoid the use of SS, the name of the paramilitary organization; similarly SA is also unused.
Simplified: The district Sächsische Schweiz uses the name of its main town, Pirna, in its code PIR, to avoid the use of SS, the name of the nazi group; similarly SA is also unused.