From Wikipedia:

The semiotic square, also known as the Greimas square, is a tool used in structural analysis of the relationships between semiotic signs through the opposition of concepts, such as feminine-masculine or beautiful-ugly, and of extending the relevant ontology.

Notes:

In an earlier post I combined an unusual representation of the semiotic square with that of the Tetralemma. Instead of using that one, please use this one instead.

References:

https://en.wikipedia.org/wiki/Semiotic_square

[*4.84]

<>