The sign you mentioned is "Exit from the highway." In Germany, this sign indicates that you are approaching an exit ramp from the highway (Autobahn). It typically appears with a blue background and a white arrow pointing to the right or left, showing the direction of the exit.

When you see this sign, it is important to prepare to leave the highway. You should signal your intention to change lanes, reduce your speed appropriately, and ensure that the lane you are moving into is clear. Be aware that exits can sometimes be narrow or have sharp turns, so it's essential to approach them cautiously.

Remember, you may also encounter signs giving distance to the exit, so keep an eye on those to ensure you are ready to exit in time. Always adhere to any speed limits or additional signs that may be present at the exit.