Los Angeles (Spanish: Los Ángeles), officially the City of Los Angeles and known colloquially by its initials L.A., is the second-most populous city in the United States, after New York City, and the largest and most populous city in the Western United States. With an estimated population of four million, Los Angeles is the cultural, financial, and commercial center of Southern California. Nicknamed the "City of Angels" partly because of its name's Spanish meaning, Los Angeles is known for its Mediterranean climate, ethnic diversity, Hollywood and the entertainment industry, and sprawling metropolis.