Balkendiagramm
... German for Bar graph (externer Link)
Bar graph means: A graph that make use of bars in order to give a visual representation that can be used compare data or amounts of sizes. A German "Balkendiagramm" always has its bars from left to right (that is horizontal). If you want a bar chart with vertical bars (upright like trees or towers) in German, say "Säulendiagramm".