In this picture, there is a knob where above the handle. This knob is use for control the door that when it is locked, only indoor handle can open the door, or otherwise both indoor and outdoor handles can open the door when it is unlocked. The knob normally state in vertical, if you want to lock it, you turn left in 180 degree, and you turn to the right in 180 degree for unlock.
The problem here is to figure out and remember which way is to unlock the door and which way is to lock the door. And people always get confused about whether the door is locked or not, because the knob state in the same position whenever you locked or not.
Suggestion
By simply adding two signs on the knob, as showing in the pictures, L with red background means locked, and U with green back ground means unlocked, therefore whichever the sign goes on the top, it shows what state is now, by doing this, its become more simple and people do not need to memorise the way of lock/unlock the door.
(to lock the door) (to unlock the door)
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