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I have a printed solution to a math problem that first puzzled me as it made no sense but then I figured out that the pound sign and the superscript three sign were actually just incorrect renderings of the less than or equal and more than or equal signs which perplexed me as I have never encountered this. Do you know what might have caused this? I tried to google it up and I found several threads where people encountered a similar issue but there was never any meaningful answer as to why it happens.

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    $\begingroup$ Your browser probably decoded the symbols with an inappropriate encoding. What’s your browser? $\endgroup$ – rschwieb Mar 21 at 23:17
  • $\begingroup$ Or the software that printed the solution incorrectly decoded the symbols. Or the receiver was using a different font than the sender, so those strange characters resulted. This sometimes happens when the sender and receiver use different keyboard encodings because they speak different languages. $\endgroup$ – GEdgar Mar 22 at 13:09

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