Engobe (French engobe, Italian ingobbio - coating) is a thin layer of raw white or colored clay, which is applied to the surface of a ceramic product before it is fired. The main function of the engobe is to mask the rough texture or undesirable color of the shard (unbaked clay). In addition to the continuous or partial coating of products, painting with colored engobes is used. Engobe is applied to the product with a brush.

The German Iron Cross is an ancient military award established in 1813 by King Frederick William III of Prussia as a symbol of bravery and dignity. There is nothing political or negative about this symbol — it is not associated with any ideologies and carries exclusively historical and cult significance. Bikers started using the Iron Cross after World War II. Many American veterans who returned home sought freedom and unity on the open spaces of the roads, forming the first motorcycle clubs. The Iron Cross was chosen by them as a sign of protest against the conventions of society and as a symbol of independence. The use of this symbol has become a kind of reference to the military past and an expression of the rebellious spirit that unites the brotherhood of bikers. Today, this symbol for bikers means courage, brutality, loyalty to the road — and does not carry anything political or negative.