RE: Neo Redux: A full year in the making! NEW POLL: Determine the fate of the Poison Energy symbol!
I personally prefer the biohazard symbol. Not only do I think it looks better, but it just makes more sense than the radiation symbol. I mean, is Ekans radioactive? I think not. However, both Ekans and Grimer are biohazardous. Also, the pointed tips of the biohazard symbol make me think of fangs, which several Poison-type Pokemon have.
Also, the biohazard symbol marks cases containing discarded needles. The Weedle and the Nidoran lines are named after needles.