Unusual mathematical terms

From time to time, I come across some unusual mathematical terms. I know something about strange attractors. I also know what Witch of Agnesi is. However, what prompted me to write this question is that I was really perplexed when I read the other day about monstrous moonshine, and this is so far my favorite, out of similar terms.

Some others:

Are there more such unusual terms in mathematics?


Jan 17 update: for fun, word cloud of all terms mentioned here so far:

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and another, more readable:

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Answer

I’ve always liked ‘abstract nonsense’.

To quote wikipedia:

Note that referring to an argument as “abstract nonsense” is not supposed to be a derogatory expression, and is actually often a compliment regarding the generality and sophistication of the argument.

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