This is the 4027th most frequent Swedish word.
nyckeln
"The key."
Here, 'nyckeln' metaphorically represents the essential factor or solution for achieving success.
Nyckeln till framgång är hårt arbete.
The key to success is hard work.
In this sentence, 'nyckeln' literally refers to a physical key used for unlocking a door.
Jag hittar inte nyckeln till mitt rum.
I can't find the key to my room.
Here, 'nyckeln' denotes an individual key on a computer keyboard, used for input.