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View > Dock Icon has two CPU choices:

  • Show CPU Activity
  • Show CPU History

I am on a dual core (MacBook Air (13-inch, Early 2014). In both views, I see 4 items.

Using High Sierra.

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While researching the Activity Monitor, I saw this:

Some of the newer Macs have hyper-threading, which makes each core appear to be two processors.

Relatively speaking, I'm less familiar with hyper-threading than older CPU technology, so I'm putting this in an answer, and letting the community vote.

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