The Wiki on Periodic Functions has this graphic:
What equation would produce that function?
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$f(x)=\left| \sin \left(x+\frac{\pi }{4}\right)\right| +1$ gives something similar. Your example is more complicated, tho. – Raffaele Oct 25 '20 at 21:45
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I have not seen any relatively-common functions that look as such; it's entirely possible that they drew up a semi-random shape and repeated it. This may not have any significant. – Oct 26 '20 at 05:40