An abbreviation for "public address system," which is an electronic sound amplification and distribution system.

ध्वनि-विस्तारण प्रणाली

English Usage: The teacher used a PA system to address the entire school.

Hindi Usage: शिक्षक ने पूरे स्कूल को संबोधित करने के लिए ध्वनि-विस्तारण प्रणाली का उपयोग किया।