What is this line doing on the engine ?

I’ve notice and I haven’t find the answer yet, so I’m here to ask you.
What is the line/pattern or whatever you call doing on/in the engine ?
image

Hello @Qantas_ryan !
I found a good link for you: http://aerosavvy.com/aircraft-engine-spirals/
Have a nice day,
@35000_feet

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To see if the engine is on/off.

Thanks, @35000_feet @Sturmovik

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