Other than a pen or marker, what would cause a "pen mark" to appear on my laptop monitor screen?

Other than a pen or marker, what would cause a "pen mark" to appear on my laptop monitor screen?
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Do you have a cat? I have seen cats scratches on screens that sound kinda like this. Are you sure glass is the right word? I’m not sure of any screens by sony that are covered in glass. Apple seems to be the only one I know of that does glass covered screens.
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