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Hitler was born 04/20. I believe 88 refers to H being 8th letter of the alphabet. (HH = 88)

You're right. It stands for Heil Hitler. Nazis apparently tattoo this kind of shit on their heads.

Google reportedly chose it because of its extremely positive associations in Chinese culture:

Every apartment in my building is exactly the same as the one on the floor above and below it.

Apartment 88 sold for nearly 50% more than 78 or 68, because it was seen as lucky by the Chinese buyers.

I'm in Sydney btw.

Which also generally applies for the sun cross, the mirrored swastika, go figure ;)

88 and 18 are the ones to watch out for with these types. They sure do love dem small numbers.