いわゆる
so-called, what you'd call
いわゆる + Noun
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いわゆる introduces a term that people commonly use: 彼はいわゆる天才だ, "he's what you'd call a genius".
It's used to bring in popular labels, jargon or concepts, often ones that are a little vague or loaded: いわゆる「おもてなし」, "so-called hospitality"; いわゆるブラック企業, "what's known as an exploitative company".
Unlike English "so-called", it isn't necessarily sarcastic. It just flags the word as a common label, not the speaker's own invention.
It always comes directly before a noun. It's common in explanations, articles and essays. Compare つまり ("in other words"), which rephrases rather than labels.
Examples
彼はいわゆる天才だ。
He's what you'd call a genius.
これがいわゆる日本の「おもてなし」だ。
This is what they call Japanese hospitality.
彼女はいわゆる帰国子女だ。
She's what's called a returnee: she grew up abroad.
いわゆるブラック企業で働いていた。
I used to work for what's known as an exploitative company.
いわゆる「オタク」の文化に興味がある。
I'm interested in so-called otaku culture.