Hmm, this is interesting, I asked ChatGPT what 'signifier' means:

A signifier is a term used in semiotics, which is the study of signs and symbols and their meanings in communication. In this context, a signifier refers to the physical or perceptible form of a sign, such as a word, sound, image, gesture, or object. It's the tangible or sensory component that carries a specific meaning or refers to something beyond itself.

For example, in the word "dog," the sequence of letters "d," "o," and "g" is the signifier. This signifier is associated with the concept or meaning of a domesticated canine animal. In semiotics, the relationship between the signifier and the signified (the concept or meaning it represents) is a fundamental concept in understanding how communication functions and how meanings are constructed through symbols and signs.

And in this Qoincidence. DJT is the signifier. The signifier is associated with Donald John Trump.

Yes, someone's initials can indeed function as a signifier of their name. In semiotics, a signifier is a symbol, word, or object that represents or refers to something else, which is known as the signified. In this case, when you see someone's initials, they serve as a visual symbol that refers to and signifies their full name.