P (Nazi symbol)
The "P" symbol or "P" badge was introduced on 8 March 1940 by the Nazi Germany General Government in relation to the requirement that Polish workers (Zivilarbeiter) used during World War II as forced laborers in Germany (following the German invasion and occupation of Poland in 1939) display a visible symbol marking their ethnic origin. The symbol was introduced with the intent to be used as a cloth patch, which indeed was the most common form, but also reproduced on documents (through stamps) and posters.