The superellipse is a real thing. It allows an exponent other than 2, and uses absolute value bars. There are technically two types, the hypoellipse (exponent under 2) and hyperellipse (exponent over 2). It’s also known as the Lamé Curve, hence Hyper’s comment. Finally, an explanation for the 2017 banner on Facebook.
Oh, did you check the mouseover? This is comic #100!
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HYPER: I can’t seem to magic our way out.
NIS: You’d need Sigma. This calls for science!
QCOSEC: Shhh. Hear that?
ELLY: Down from the sky! She’s absurd, likes flat planes, she’s... SuperEllipse! And she's ready to return to math.
HYPER: S-So lamé.
ELLY: I’ve missed you too, Hyper.