[tupshin]

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_rel...

https://ncatlab.org/nlab/search?query=SEMIOTIC

[nextaccountic]

But why?? ncatlab contains formalizations of many branches of philosophy, such as this on Hegel

https://ncatlab.org/nlab/show/Science+of+Logic