As said in this video below,
The number 1 satisfies every single property of wau.
eg: first answer by Patrick Yu in the below question:
So what's so special about wau? Isn't it equal to one?
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$\begingroup$What Vi Hart did was pretty much the same as what the people behind dihydrogen monoxide (written out, it looks like H$_2$O) did. She just hid the name behind something really cool sounding as a joke.
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