A poster of the Irgun Zvai Leumi (National Military Organization), “Irgun” for short, which began its terrorist campaign against the Palestinians in September 1937, and was the parent body of the "Stern Gang".
The Hebrew letters inside the square stand for “only thus" This way, as indicated by the map and the superimposed rifle, was the establishment of Israel by force on both banks of the Jordan River, ie., in Palestine and Transjordan. The date of the poster is ca. 1946.
The translated transcript says "only solution".
Irgun emblem: The map shows both Mandatory Palestine and the Emirate of Transjordan, which the Irgun claimed in its entirety for a future Jewish state. The acronym "Etzel" is written above the map, and "raq kach" ("only thus") is written below.