Broad spectrum sound created by overlaying 2000 constant sine waves with frequencies chosen at random between 20Hz and 20kHz (uniform sampling).
This sounds a lot like white noise (moreso than I thought it would) - if you look at the power spectrum it's reasonably similar (though there are some gaps because 2000 waves isn't enough to fully fill out the spectrum).
However I don't think it's (true) white noise because it lacks the necessary randomness to qualify as noise. Randomness is a big subject - there's no single test for this, though autocorrelation and statistical independence are commonly employed.
You can investigate this in Audacity (and similar programs) by using the Analyze | Plot Spectrum... function.
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