The kanji 階 primarily represents "stairs," "staircase," or "floor" in a building. It signifies a level or a step in a structure, or the position of something in a hierarchical or spatial arrangement. It can also refer to a rank or degree.

・On-yomi (音読み): カイ ・Kun-yomi (訓読み): きざはし

⚫︎階段 Translation: stairs; staircase ⚫︎一階階 Translation: first floor ⚫︎上階階 Translation: upper floor(s)

The kanji 階 is a phono-semantic compound (形声文字). The left side is a radical called 阝 (also written as 阜), which is a component referring to a "hill" or "slope." The right side is a phonetic component 皆, which gives the sound "kai." This combination suggests the idea of "stairs" or "steps" ascending a slope or hill. The character thus originally depicted the concept of steps or levels.