Is there such thing called a person?

Yes there is. A person is an upright walking mammal, also called a human being. As of today, there are more than seven billion of these creatures on Earth. You must have seen some, you didn't ask a question on the internet from a unit made of twigs and leaves; unless you're asking the question from a galaxy far, far away. In which case, yes, there are over seven billion of us here.