If you look at the couple of semiotics related pages that ncatlab had, they all moved offsite, so it's just that ncatlab doesn't address semiotics, not that the

If you look at the couple of semiotics related pages that ncatlab had, they all moved offsite, so it's just that ncatlab doesn't address semiotics, not that they don't address the algebraic interpretation of it. https://oeis.org/wiki/Sign_relation#Semiotic_equivalence_relations https://oeis.org/wiki/Sign_relation#Semiotic_equivalence_rel... https://ncatlab.org/nlab/search?query=SEMIOTIC https://ncatlab.org/nlab/search?query=SEMIOTIC