What is "Other diffraction phenomena?"

[PreMade]

I know we have to know double slit, diffraction grating, single slit, and x ray, but what others are they referring to?

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[Blueprint MCAT Tutor]

If I had to guess, they just stuck that in there as a catch-all term to refer to just knowing about diffraction in general. Or to mean something like: "Hey, heads up that we might give you a physics passage about diffraction but the passage itself will introduce some crazy crap you've never heard of before, but don't worry the questions will still just be basic questions about light, interference, diffraction, etc."