As said in this video below, https://www.youtube.com/watch?v=GFLkou8NvJo
The number 1 satisfies every single property of wau.
eg: first answer by Patrick Yu in the below question:
https://www.quora.com/What-is-the-number-Wau
So what's so special about wau? Isn't it equal to one?
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.