Wikipedia
The Kotwica (; Polish for " Anchor") was a World War II emblem of the Polish Underground State and Armia Krajowa (Home Army, or AK). It was created in 1942 by members of the AK Wawer Minor sabotage unit, as an easily usable emblem for the Polish struggle to regain independence. The initial meaning of the initials PW was Pomścimy Wawer ("We shall avenge Wawer"). This was a reference to the Wawer massacre (26–27 December 1939), which was considered to be one of the first large scale massacres of Polish civilians by German troops in occupied Poland.
At first, Polish scouts from sabotage groups painted the whole phrase upon walls. However, it was soon abbreviated to the letters PW, which over time came to symbolise the phrase Polska Walcząca ("Fighting Poland"). Early in 1942, the AK organised a contest to design an emblem to represent the resistance movement, and the winning design (pictured) by Anna Smoleńska, a member of the Gray Ranks who herself participated in minor sabotage operations, combined the letters P and W into the Kotwica.
Smoleńska was arrested by the Gestapo in November 1942 and died in Auschwitz in March 1943, at the age of twenty three.