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For your convenience,
U+3164 is
ㅤ
(unprintable), Hangul Filler, and U+537C is 卼, a Chinese character rarely ever used, meaning unsteady or dangerous.Edit: I did not realize that U+537C may not be rendered on some devices without a CJK font installed. Here is what it’s supposed to look like:
One shows “HF” in a dotted box and one shows a rectangle.