This is the 18342nd most frequent Russian word.
щель
A narrow gap, crack, or crevice.
The word 'щель' denotes a narrow opening or crack in a structure, in this case, a wall.
В стене была узкая щель, через которую проникал свет.
There was a narrow crack in the wall through which light penetrated.
Here, 'щель' refers to a gap that is visible between two adjoining parts, specifically the door and its frame.
Он заметил щель между дверью и косяком.
He noticed a gap between the door and the frame.
In this usage, 'щель' symbolizes an opening that provides a limited view, emphasizing visibility through a specific context.