The international biohazard symbol, a symmetrical trefoil originally designed in 1966 to be "memorable but meaningless," serves as the core visual. In digital wallpapers, artists often reinterpret this symbol through various lens:

Gritty textures featuring broken glass, rusted metal, or medical hazard tape.

Glowing green or radioactive blue designs on stark black backgrounds.

High-definition renders of the Resident Evil (known as Biohazard in Japan) logo, characters like Jill Valentine, or laboratory environments. Technical Specifications for 1920x1200 Biohazard Warning Symbol - Science History Institute