Proper nouns indicate a blank person place or thing?

Proper nouns usually understood as a noun that is capitalized. In order to be a proper noun, like any other noun, the word must be a person place or thing. Proper nouns no matter what, are in a sentence and have is capitalized

A proper noun indicates a specific person, place or thing. For example, Ronald Macdonald, New York City or Tiffany lamp. They have to be capitalized in the sentence.