Using forward slash


Hello, I just want to know what the forward slash [ / COUNT(*) ] in the answer for this exercise is used for? It's the first time I've seen it anywhere. If I had to guess it's for division, but I've been wrong a lot with SQL. Thank you!

SELECT state, 
		100.0 * SUM(CASE WHEN elevation >= 2000 
            THEN 1 ELSE 0 END) / COUNT(*)  
            as percentage_high_elevation_airports 
FROM      airports 
GROUP BY  state;


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