Sex-segregated public bathrooms existed since at least the 1880s, originally labelled in writing. The stick-figure pictograms were popularized with their introduction by British Rail in the 1960s. The genius behind the stick figure toilet signs, BBC Future (2014): "One of the best early examples of intuitive global signs for public lavatories was that created for British Rail in the mid-1960s. [...] In the 1970s, the British example was developed on a more comprehensive basis in the United States. In 1974, the US Department of Transportation commissioned the American Institute of Graphic Arts to create a set of pictograms to be used throughout public transport networks whether road, rail, air or sea." "In Poland, meanwhile, you can come across lavatories indicating 'gents' with a triangle and 'ladies' with a circle, while in Lithuania men are represented by an inverted pyramid and women by a pyramid standing the right way up."
Wilson, Ara (2018-07-24). "Visual Kinship". History of Anthropology Review (in English). பார்க்கப்பட்ட நாள் 2019-12-02.{{cite web}}: CS1 maint: unrecognized language (link)
