How you can flip text with no image
There is no “rotate” setting in Unicode. Instead, each letter is swapped for a different character that happens to look like it rotated: ɐ (a turned a from the phonetic alphabet), ǝ (turned e), ɥ (turned h), and so on. Then the order is reversed so it reads correctly when the screen is turned over.
A few capitals have no good lookalike, so they come from Lisu and other scripts that share the shape.