Developed in the late 1960s by Charles Baldwin, an environmental health engineer working for Dow Chemical Company, the symbol was intended to warn individuals of potential biological hazards. (impeccablenestdesign.com)
Also the plans proposed so far do not include tests for biohazard potential in Earth-like environments prior to return to Earth. (science20.com)
Journey1
As a result, these plans depend on adequate containment of the samples during the return journey and in the receiving facility on Earth until the tests can be completed on Earth. (science20.com)