What is the name of the triangular symbol used to indicate indicate radioactive material or radiation?
by 
wickedwillie
ANSWERS: 1
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It is simply called the trefoil symbol. The Unicode encoding of this symbol is U+2622. The name derives from the Latin "trifolium", meaning three-leaved plant, which is why rrefoil is also a common name for some kinds of clover, which have three-foiled leaves.
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