why is it called a restroom sign —

Founded why is it called a restroom sign models & stl files for printing
Wicker Vase
Senksis 3D
Jewelry Cup
roprint2
Stackable Sifter mySifter
DanielHomeDesign
Screwball
lysithea81
Toothless
Hitherefriendo
Hypno Missile Toad
Codiac2600
Pen holder phone
Watcher2006
Mushroom
Gritty_Destroyer_of_Worlds
Pokeball
HDriod312