Since the 1960s, male and female pictograms that were developed for the British rail system – often color-coded blue and red – have become the norm for marking public toilets in much of the world, with the female symbol distinguished by a triangular skirt or dress, and in early years the male symbol stylized like a tuxedo. Schoolhouse outhouses in the 19th-century United States had ventilation holes in their doors that were shaped like a starburst Sun ✴ or like a crescent Moon ☾, respectively, to indicate whether it was the boys' or the girls' toilet.
Main articles: Public toilet § Society and culture, and Unisex public toilet This convention was quite influential for a time, and his convention of prioritizing male kin by placing them to the left and females to the right continues to this day (though there have been exceptions, such as Margaret Mead, who placed females to the left). R River distinguished gender in the words of the language being recorded by writing male kinship terms in all capitals and female kinship terms with normal capitalization. īefore a shape distinction was adopted, all individuals had been represented by a circle in Morgan's 1871 System of Consanguinity and Affinity of Human Family, where gender is encoded in the abbreviations for the kin relation (e.g. Pedigree charts published in scientific papers use an earlier anthropological convention of a square □ for male and a circle ○ for female. Kinship charts use a triangle △ for male and circle ○ for female. Minimal kinship chart: a male and female producing male and female offspring
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