I just came up with the following puzzle. I don't think anything like this has been asked here before, but I may be wrong.
What's the next symbol in this sequence?
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Hint
$\pi$ and xor
Spoiler
Write the digits of pi on a 7-segment display and generate every symbol in the sequence by combining the previous symbol with the next digit of $\pi$ with an xor. Start with all segments off.