This is the German traffic sign for die Autobahn (-en) (highway(s), motorway(s)) - pronounced [ˈaʊtoːbaːn] (like ow-to-baan). There’s no general speed limit on German Autobahnen. Unless you see a sign that tells you what the speed limit is, you can drive as fast as you want.
The different highways are named by the capital letter “A” (for Autobahn) and a single digit number for the main ones (e.g. the A 3 which is a West-South track). The smaller/shorter ones usually have two digit numbers (e.g. A 73 from Suhl in Thuringia to Nuremberg in Bavaria).
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