Need to know what this line is?

2001 d penny. Through the a and m. There is a line. It's like a thick line. What is It?

 

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Linear Plating Bubble

 

Is that something cool? Or not so cool? Does it mean anything?

 

Nope. Just like a normal plating blister but in a straight line. Just junk.

 

Ok. Thank you.

 

while you are on lines .. you might as well learn about "Die Polishing Lines" too ==> https://www.cointalk.com/threads/ms75-bi-centennial-quarter-j-k.316357/

You may want to search the internet for more information about them too.
I've recently learned about them in that thread.

 

Okay thank you