What is this symbol called which is used to denote "II" in the second season of "The Quintessential Quintuplets"? The Japanese title for &quot;The Quintessential Quintuplets 2nd season&quot; is 5-toubun no Hanayome ∬. I assume &quot;∬&quot; to be number 2 or &quot;II&quot;. But this symbol looks more like the Integral symbol or &quot;Double Integral&quot; to be precise. This symbol is used in mathematics and is never stylized to show numbers or anything. So, is this symbol anywhere present in Japanese script? Or is it just a cursive way of writing &quot;II&quot; that ended up looking like integrals?
No, you're right, that is absolutely the double integral sign. There's a trend of indicating follow-on seasons of shows with indicators like random punctuation marks or letters (see, e.g. this question about Nisekoi: or this one about Dragon Ball Z), and this is almost normal by comparison since it does actually look a bit like a stylised II rather than, for example, adding an apostrophe or a random letter.
It's also vaguely relevant to the show itself - since Uesugi was brought on to tutor the five girls in subjects such as mathematics, which potentially includes a little bit of calculus.