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Ah thanks! Now I get the Private Use unicode stuff.

So the question should rather be addressed at my ios device, "why the hell does ios render a train glyph for U+E01F?"

Same reason it renders U+F8FF as something (I've seen it render as the Klingon logo, as Tux; currently some font on my system is using it for a stylized 't' surrounded by brackets), because someone wanted some glyph available not in Unicode. You'll have to ask Apple about the why.

Just bear in mind that those glyphs have no meaning at all without the font that includes them. Without the font, you get a □ or better, a block of Unicode tofu — a square filled with the numbers and letters of the hex code for that codepoint.

Interestingly, my Mac does not…

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