In semiotics, the four letters p-i-p-e constitute _____?

In semiotics, the four letters p-i-p-e constitute _____?

Explanation

In semiotics, the word "pipe" (the letters p-i-p-e) is a signifier, which is the form that represents something.

The signified is the concept or object that the signifier refers to — in this case, the idea or image of a pipe.