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Bonus points if there's a known onomatopoeia to describe the sound.
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this post was submitted on 01 Apr 2024
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Snow or static. It's cosmic microwave background radiation - the remnants of the big bang.
Some of it is cosmic background radiation - it's also machine vibrations, manufacturer defects, power line radiation, and nearby appliances. The more remote and well shielded you are the more likely it's pure background radiation... but in a big city it's likely to be local radiation sources. The inverse square law has a big role here.