It would be best if you posted a link to an image in the related links section so people can see exactly what you are talking about.
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Because if you turn a nine upside down then it does not look like anything but if you turn a six upside down then it looks like a nine.
SIS
In set theory, the symbol of intersection is ∩, like an upside down U.
It looks like an upside-down "T".
The hazard lights.