What is the name of the primary symbol, which is now outlawed outside of the context of art or science, and was widely used even on the state flag?
Strafgesetzbuch section 86a The German "Strafgesetzbuch" (Criminal Code) in § 86a outlaws "use of symbols of unconstitutional organizations" outside of the contexts of "art or science, research or teaching". This concerns Nazi symbolism in particular and is part of the denazification efforts following the fall of the Third Reich.
List of Maryland state symbols This is a list of symbols of the U.S. state of Maryland. The majority of the items in the list are officially recognized symbols created by an act of the Maryland General Assembly and signed into law by the governor. However, two of the more famous symbols of Maryland, the state motto and the state nicknames, were never made official by the state government. While the state seal derives from the colonial heritage of the state, the majority of official state symbols were designated in the last few decades.