I made an icon!

(Gankable; credit ftmichael if you take it, please.)

Icons of the sign already exist, but I didn't have one and didn't feel like asking all over the place, so I just googled it and made my own from this image.

From http://www.virtualtourist.com/travel/Europe/Germany/Land_Berlin/Berlin-75302/Things_To_Do-Berlin-Checkpoint_Charlie-BR-1.html :
When Berlin was still divided, you saw these signs all over the place at the wall: 'You are leaving the American sector.' They were there before the wall was actually built in 1961. After the war (until 1990), Zehlendorf, Steglitz, Schöneberg, Kreuzberg, Tempelhof and Neukölln belonged to the the American sector. The only sign still existing nowadays, however, is at Checkpoint Charlie.