"Totenkopf (German: [ˈtəʊtənkɒpf], i.e. skull, literally "dead´s head") is the German word for the skull and crossbones (or "death´s head") symbol. The "skull and crossbones" symbol ...
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is an old international symbol for death, the defiance of death, danger, or the dead, as well as piracy or toxicity. It consists usually of the human skull with or without the mandible and often includes two crossed long-bones (femurs), most often depicted with the crossbones being behind some part of the skull.
The term Totenkopf is commonly associated with 19th- and 20th-century German military use." - (en.wikipedia.org 29.06.2021)