Restroom Etiquette
Whoever made this clever bathroom sign wanted to do more than differentiate which room is for whom. It also reminds the users of a very popular and widely accepted etiquette. The toilet seat illustrations remind male users to leave the toilet seat up for the next person as a courtesy, while female users keep it closed for the same reason.
For those who already know of this practice, the illustrations are enough to show them the right door to use. However, for those unaware of this, there are also small inscriptions of ‘w’ and ‘m’ there to do the job.