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World first: antimatter particles transported in Geneva
(www.swissinfo.ch)
General discussions about "science" itself
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What does the transport safety square look like for a truck shifting anti-matter?
https://unitednuclear.com/fun-scientific-stuff-c-28_54/antimatter-hazmat-sticker-p-1118.html
Something like this?
I adore how the rest of the fire diamond has absolutely no purpose and can be omitted
This is my favourite I've seen so far.
In the US it would just be for the compressed refrigeration gasses (if any), likely 2-1963. If you felt cheeky you might have a Class 7 plaquard (radiation) too, but you'd probably get in trouble for incorrectly labeling your cargo since 100 anti-protons isn't exactly a radiological threat.