Is it permissible to write "Subhan Allah" (Glory be to Allah) on a doorknob?

There is no harm in writing "Subhan Allah" (Glory be to Allah) on the door in a suitable place where it will not be dishonored, because it serves as a reminder of Allah's remembrance and love. However, it is disliked to write it in an unsuitable place, like the doorknob, because that entails dishonoring it.