Those who have been long-time readers will remember a proposition I made for an antimatter hazard symbol (otherwise and less formally called a “warning sign”) back in May of 2010, which was based on currently-accepted international hazard symbology and color schemes.
Well, to date, I am excited to report that the symbol has found some early adopters across the cyberverse. Foremost amongst these is the website, WeInterrupt.com, who made a stab at a somewhat technical, somewhat tongue-in-cheek article featuring the symbol last June.
Much earlier, (a year ago last November,) the site “ParanoidNEWS.org” incorporated the symbol into a fairly fantastic, paranoid montage with a nuclear mushroom cloud (at right) cresting a somewhat crass article about the potential development of antimatter weaponry.
Patently alarmist, and the color scheme was artistically distorted, but still a cool image.
Finally, in August, a blog called “AngelsDoSpeak” included the symbol in a breakdown of potential nuclear fallout or activity symbols. (The purpose of the symbol’s inclusion here on a religious site was a little confusing or perhaps ominous, but I’m happy with adopters all the same.)
While I should note that there have been other internet-promoted proposals for an antimatter hazard symbol, I feel quite strongly (based on my current work in the radiological protection industry) that instead of attempting to promote a new glyph or design into the hazard iconograhy pantheon, any antimatter symbol should derive from internationally-recognized symbology already in place. This symbol should then simply be evolved/modified to capture antimatter’s potential hazard as a highly-reactive source of radiative energy, which I believe the above symbol does quite nicely.
-And while this effort is admittedly precautionary, the recent discovery that the Earth’s magnetic field traps naturally-ocurring antiprotons into a belt (a la the Van Allen Radiation Belts) may make orbital harvesting of antimatter a plausible pursuit.
In any case, feel free to promote the hazard symbol or use in your own projects or research if you so desire, and as always, comments are welcome.
Chronicles of an Atomic Astrowright 
I will promote the symbol. It is cool-looking.
Awesome! Much obliged, and thanks for reading!
Love the symbol for tradition and recognition purposes in terms of symbolism. I would suggest making the anti/pro circles larger though for easier recognition at a glance and establish more difference from the radiation hazard symbol.