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The B787 has these chevron-shaped teeth on the exhaust port of its engines to reduce noise.

https://upload.wikimedia.org/wikipedia/commons/6/6b/Toothed_exhaust_duct_covers_on_a_Boeing_787.jpg

And according to the answer to this question they will be incorporated into the new B737's

Can anyone explain how these work to reduce noise?

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    $\begingroup$ Ah, thanks. It's a dupe. Can the noise tag be added to the original. I didn't find it. $\endgroup$ – TomMcW Aug 10 '15 at 16:00