Upside down characters?

I just saw that Facebook are offering a "translation" in English - Upside Down. My first thought was "who would ever design such glyphs?". Then, after looking at the characters I realized that they are not really turned around, just close enough. For example, a lower case U for an upside-down lower-case N.



abcdefghijklmnopqrstuvwxyz
ɐqɔpəɟᵷɥıɾʞlɯuodbɹsʇnʌʍxʎz

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