This reminds me of the simple substitution cipher that coin, diamond, and antique dealers use on their price tags to encode the lowest price their staff are all

This reminds me of the simple substitution cipher that coin, diamond, and antique dealers use on their price tags to encode the lowest price their staff are allowed to take during bartering: https://forums.collectors.com/discussion/760945/how-do-dealers-come-up-with-their-price-codes https://forums.collectors.com/discussion/760945/how-do-deale... https://puzzling.stackexchange.com/questions/109089/cracking-prices https://puzzling.stackexchange.com/questions/109089/cracking... https://en.wikipedia.org/wiki/Substitution_cipher#:~:text=In%20lists%20and%20catalogues%20for%20salespeople https://en.wikipedia.org/wiki/Substitution_cipher#:~:text=In... Also related, only very tangentially, but ever-interesting, FEMA's Waffle House Index (2016): https://news.ycombinator.com/item?id=15105662 https://news.ycombinator.com/item?id=15105662