A dated British term for electromagnetic pulse (EMP) -- the burst of electromagnetic energy from a nuclear detonation that can disable electronic systems across a wide area. The term was used in UK civil defense and military planning contexts during the Cold War era. It is now largely replaced by the standard international acronym EMP in both technical and popular usage.
The civil defense manual warned about the effects of radioflash on communications infrastructure.
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(UK, dated) electromagnetic pulse.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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