Typically means those that are highly sought after and/or heavily recruited out of top tier undergrads (i.e. firms with a lot of Ivy/Stanford/MIT/etc alums in the firm). Traditionally, that would be McKinsey, Bain, BCG, the bulge bracket banks (or what's left of them.. GS, MS, JPM, Citi, UBS, CS, and in the old days Merrill, Lehman and Bear), boutique IB (Lazard, Greenhill, Blackstone, Houlihan, Moelis, etc.) as well as top tier PE funds like TPG, KKR, Thomas Lee, Golden Gate, etc, top tier VC funds, top tier hedge funds. And the "sexy" VC funded darlings of the moment that attract the Ivy types.
Another way to put it is it's the kinds of jobs that Ivy League types and MIT/Stanford/Caltech engineers want and get.
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