PN is an abbreviation for the term “proper noun,” which refers to a specific person, place, or thing. Unlike common nouns, which are general and can refer to any member of a group, proper nouns are unique and refer to a specific individual or entity. Examples of proper nouns include names of people (e.g. John Smith), names of places (e.g. New York City), and names of organizations (e.g. United Nations). Proper nouns are always capitalized and play a crucial role in providing clarity and specificity in language. Without proper nouns, our conversations and written communication would lack the personal touch and precision that make them truly meaningful.