In English, we know the expression that a key has a bit. This is the part of the key that goes into the lock and turns to open and close it. This is especially true of older keys. It is the most conspicuous part of a key, and if you find a drawing or symbol of a key here and there - for example in the church painting of St Peter's - it is because the key has a bit. In the future, doors may only have electronic locking systems - there will be no need for a key with a bit, and many people will forget what a bit and a key originally had in common. Anyone reading the old text might be confused. It can be the same today when you encounter something unfamiliar. Your lack of knowledge is not an indication that there is no reality. Perhaps this will help you.
I wish you an extraordinary day!
