층

Noun

 * 1) storey or floor
 * 2) a layer
 * 3) a level

Usage notes
Sino-Korean numerals, written almost always with Arabic numerals, mean ordinals. Native Korean numerals, generally written with hangeuls, mean cardinals.
 * 1층, 2층, 3층.
 * The first floor, the second floor, the third floor.
 * 한 층, 두 층, 세 층.
 * One storey, two storeys, three storeys.