The manhole covers in Rostock display the coat of arms of the city. The coat of arms dating back to 1367 depicts a golden griffin of a blue field (representing the former princes of Rostock) with bars of silver and red (the colours of the Hanseatic League). As a member of the Hanseatic League the city is generally named Hansestadt Rostock.

• Coat of arms of Rostock (Wikipedia)