Kev nyab xeeb tawm yog cov stairwells rau kev nyab xeeb ntawm kev khiav tawm ntawm cov neeg ua haujlwm, kev nkag thiab tawm ntawm cov ntaiv sab nraum zoov, lossis tawm mus ncaj qha rau thaj chaw nyab xeeb sab hauv tsev thiab sab nraum zoov. Hluav taws kub kev nyab xeeb kev nyab xeeb cov paib yuav tsum tau ntsia saum lub qhov rooj hluav taws los pab cov neeg nrhiav txoj kev khiav kom raug.