universal gender icons or restroom signage simplified

gender icons pictograms male female restroom signage black white background universal symbols identification simplistic design silhouettes nonverbal communication accessibility international visual language representation silhouette figures iconography figure bathroom signs distinction cultural signifiers simplicity symbolic efficient crosscultural cues marks genderspecific modern pictorial binary system social norms messaging informative graphics art recognition understanding basic shapes graphical elements unisex exclusion accessible information simplified representing commonly used