Biological Hazard (pocket-sized version)

A biological hazard or biohazard is an organism, or substance derived from an organism, that poses a threat to (primarily) human health. This can include medical waste, samples of a microorganism, virus or toxin (from a biological source) that can impact human health. It can also include substances harmful to animals. The term and its associated symbol is generally used as a warning, so that those potentially exposed to the substances will know to take precautions. There is also a biohazard HCS/WHMIS logo which utilizes the same symbol.

The symbol was developed in the 1960s by Dow Chemical company for their containment products. All parts of the Biohazard sign can be drawn with a compass and ruler.

(Coincidentally, Biohazard is the name of a band originally based out of Brooklyn, New York. They are acknowledged as one of the earliest bands to fuse hardcore punk and heavy metal with elements of hip hop music.)

See also:
https://www.cafepress.com/biohazard1