I Wonder How Many Tones You Can Add to a Chord before it's a Color of 'Noise'

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A Youtuber explained 'why big-rigs don't do "backup beeps" anymore' ... he says they've been replaced by 'white noise bursts.' I was curious 'why they call it "White Noise,"' and found out that--as white light uses the full intensity of every light-frequency--White Noise plays the full intensity of every sound-frequency. https://www.youtube.com/watch?v=Co-g_JeTiF8 (And I hear it REALLY IS the sound you're hearing--the echo of the Big Bang?--when your TV is playing static like the linked video shows.) I misinterpreted that definition, and thought White Noise meant 'playing all the NOTES at the same time'---maybe 'all the notes' are included, but the White Noise also includes all frequencies above, below & in between, yeah? So I'm wondering ... how many notes until it changes from a 'chord' (even a slightly "discordant" chord) to a 'noise of a color.'